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Schusterolejeunea inundata var. fontinaloides (Spruce) A.M.Sierra & C.E.Zartman, comb. nov. (Fig. 4) Lejeunea inundata var. fontinaloides Spruce, Transactions and Proceedings of the Botanical Society of Edinburgh 15: 278 (Spruce 1884). LECTOTYPE. — Brazil. Est. Amazonas, Paricatuba, leg. Spruce s.n. (lecto-, designated in Grolle 1980, MANCH!; isolecto-, G). SPECIMENS EXAMINED. — Brazil. Amazonas, along the Rio Cauaburi between the Rio Negro and the Cachoeira do Carangueijo, 0°15’00”S, 65°55’00”W, mostly rocky flood plain forest, 3.VII.1979, Buck W.R. 2314 (INPA!, NY); Rio Negro, igarapé Foibara, vecinity of first cachoeira of the Igarapé Foibará of Rio Negro, 0°16’00”S, 66°35’00”W, Terra firme forest, 22.VII.1979, Buck W.R. 2627 (INPA!, NY); Schuster R.M. 79-21-1135 (INPA!, NY); Santa Isabel do Rio Negro, Rio Cauaburi, 0°15’00”S, 65°55’00”W, Schuster 79-10-295 (INPA!, NY); Ilha Acarabu, at the mouth of the Rio Marié, 0°25’00”S, 66°25’00”W, Marshy forest, 4.VII.1979, Schuster R.M. 79-11-302 (INPA!, NY); Manaus, Rio Negro, igapó forest in the island in front of the Praia da Lua, 3°01’56.5”S, 60°09’44.7”W, epiphyte on trunk in seasonal inundated forest (igapó), 25.XI.2017, Sierra A.M. 4583, 4582, 4586 (INPA!, PMA!); São Gabriel da Cachoeira, Rio Negro, banco de areia frente da cidade de São Gabriel da Cachoeira, 0°08’29.2”S, 67°05’04.1”W, sobre rochas sazonalmente inundável, 14.XII.2017, Sierra A.M. 4642 (INPA!); Rio Negro, 20 km descendo da cidade de São Gabriel da Cachoeira, Ilha Cariuari, 0°11’45.8”S, 67°00’10.9”W, floresta de igapó, 17.XII.2017, Sierra A.M. 4713, 4724 (INPA!, PMA!), 4714, 4718, 4720 (INPA!, SP!), 4719 (INPA!, SP!, PMA!), 4710 (INPA!); Rio Uaupés, Sitio São Paulo, 0°02’50.3”N, 68°29’05.7”W, epífita sobre ramas na margem do rio, 21.XII.2017, Sierra A.M. 5055, 5063 (INPA!, PMA!), 5056, 5059 (INPA!, SP!, PMA!); São Gabriel da Cachoeira, Rio Negro, Ilha em frente a São Gabriel da Cachoeira, 0°07’49.0”S, 67°05’21.1”W, sobre pedra na ilha, 20.VII.1979, Yano O. 2103 (INPA!, SP); Rio Negro, Temenduí, 0°22’00”S, 64°42’00”W, sobre rochas grandes submersas na água, 29.VI.1979, Yano O. 1536 (INPA!, SP); Rio Negro, São Tomé, Margem do rio, 0°22’00”S, 64°10’00”W, 29.VI.1979, Yano O. 1528 (INPA!, SP); Rio Negro, Ilha Acarabu, 0°40’00”S, 66°40’00”W, sobre raízes de plantas submersas na água, 4.VII.1979, Yano O. 1640 (INPA!, SP); Rio Negro, NW de São Gabriel da Cachoeira, em tronco submerso na água, 21.VII.1979, Yano O. 2139 (INPA!); Novo Airão, Parque Nacional Jaú, Carabinani river, 2°02’38”S, 61°33’28”W, rheophyte on sand along the Carabinani river, X.2007, Zartman C.E. 7547, 7544 (INPA!). See Appendix 1. DISTRIBUTION. — Schusterolejeunea inundata var. fontinaloides (Spruce) A.M.Sierra & C.E.Zartman, comb. nov. is relatively common in the Brazilian Amazon. It is known from several localities in the state of Amazonas along the Rio Negro Basin (including the type locality), and in the Rio Pacaás Novos in Rondônia. HABITAT. — Schusterolejeunea inundata var. fontinaloides (Spruce) A.M.Sierra & C.E.Zartman, comb. nov. occurs in fast-flowing streams in black water seasonally flooded igapó forests in the Amazonas state, as well as white water várzea forests along Rio Pacaás Novos in Rondônia state (Appendix 1). It grows attached to rocks, tree branches, roots, trunks, and leaf surfaces. DESCRIPTION Habit Plants small to medium in size, shoots up to 2 cm long and 1-2.5 mm wide, pale to dark green or yellow, creeping to loosely pendant, highly branched, with numerous gametangia, usually with fertile innovations. Branches Lejeunea - type. Stems Primary stems in cross-section with seven cortical and three medullary thick-walled cells, epidermis slightly enlarged, without hyalodermis; ventral merophytes two cells wide. Leaves Distant to continuous, patent, obliquely spreading, to suberect (45° with stem) insertions short composed of two ventral and 3-4 dorsal cells, ovate, (350) 600-1200 µm long, (160) 280- 570 µm wide, (1.5) 2-5 times as long as wide, apices rounded, plane, margins entire, dorsal margins arched, ventral lobe margins slightly to widely arched after the lobule keel. Cells with numerous chloroplasts, oil bodies finely granular, 2-4 per cell. Leaf lobe cells hexagonal, quadrate, or rectangular, thin-walled, trigones small, intermediate thickenings scarce, cuticles smooth. Basal laminal cells hexagonal to rectangular (16-50 ×9-24µm), mid laminal cells short, rectangular to quadrate, rarely hexagonal (10-30×10-25µ m), marginal cells mostly quadrate to short rectangular (10-23 (30) ×10-19 µm). Stylus unicellular. Lobules Small, usually well-developed, broadly expanded, arching obliquely upward or erect parallel to the stem, triangular or fin shaped, (170) 250-510 µm long, (80) 130-200 µm wide, covering less than 1/4 of the leaf lobes, with a narrow base, keels straight to arched, formed by 6-12 cells; apices rounded. Teeth inconspicuous, formed by two cells with a marginal hyaline terminal papilla at the lobule apex. Underleaves Small, narrower than the stem, 2-6 × longer than wide, (140-360 ×50-115µ m) narrowly bifid with erect lanceolate lobes composed of 3-13 cells long, lobes at base composed of 2-4 cells wide, sinus deeply V-shaped. Rhizoids brown or hyaline, up to 11-16 µm wide and thick-walled (3µm wide). Autoicous Androecia numerous, on short lateral branches at both sides of the stem. Spikes (420-1100 (1700) × 350-570 µm) with 2-4 (8) imbricate pairs of perigonial bracts; bracts ovate bilobed, and emarginate at the apices. Bracteoles arise as underleaves for each bract pair. Gynoecia on short lateral branches originating at the bases of vegetative leaves, 2-4 in a monochasial row with 1-3 innovations of the pycnolejeuneoid type, which is again fertile (except the outermost one). Female bracts (630-750 µm), short, obovate, bilobed, entire margins with emarginated or obtuse apices; lobules lingulate, with rounded apices. Bracteoles like the underleaves. Perianths obpyriform (580) 630- 720× 250-430µ m, with five distinct keels 2/3 of the perianth length, keel margin entire or crenulated by bulging cells, beak short 2-celled. COMMENTS This variety is easily distinguished by its ovate leaves which are 1.5-2.5× longer than wide, small lobules, covering less than half of the leaf lobe, usually triangular with the keel extending to 6-12 cells. Within an individual specimen, this taxon may show morphological variability among primary and secondary branches, as some secondary shoots may present small elliptical leaves with lingulate lobules. However, primary stem characters hold to the above description.

Schusterolejeunea inundata (Spruce) Grolle (Fig. 3) Journal of Bryology 11: 105 (Grolle 1980). LECTOTYPE. — Brazil. Est. Amazonas, fl. Negro, supra cataractas, ad arbores riparias, leg. Spruce L319 (lecto-, designated in Grolle 1980, MANCH!; isolecto-, G). SPECIMENS EXAMINED. — Brazil. Amazonas, Presidente Figueiredo, Rio Uatumã, 1°57’45.4”S, 59°27’40.6”W, corticicola umbrófila na margem do igapó, 21.II.1978, Ivo P. et al. 3431 (INPA!); Heliofita coletado em tronco de palmeira, na margem da beira do igapó, 21.II.1978, Ivo P. et al. 3432 (INPA!); Rio Uatumã a 4 km da Cachoeira, 1°57’45.4”S, 59°27’40.6”W, sobre galhos de árvore da beira do igapó, 20.II.1978, Lisboa P. 1096 (INPA!); Santa Isabel do Rio Negro, Rio Cauaburi, 0°15’S, 65°55’W, 3.VII.1979, Schuster 79-10-288 (INPA!, NY); São Gabriel da Cachoeira, Igarapé Ia Mirim, above the camp to Morro dos Seis Lagos, 0°17’06”N, 66°40’36”W, abundant on rock, twigs and leaves along the river, 1.IX.2011, Zartman C.E. 8751 (INPA!, SP!); Roraima, Caracaraí, Parque Nacional Serra da Mocidade, Rio branco, 1°23’03.7”N, 61°39’23.0”W, 4.III.2017, Zartman C.E. 9867 (INPA!, PMA!); Rondônia, Guajará-Mirim, Pacáas Novos, along the Rio Pacáas novos, between its confluence with the Rio Mamoré and the first rapids, 10°51’40.8”S, 65°16’21.5”W, Varzea forest, epiphyll, immersed in river by rising water, 8-13.III.1978, Reese W.D. 13291 (INPA!, NY); on twigs under water in the river, 8-13.III.1978, Reese W.D. 13288 (INPA!, NY); Pará, Serra do Cachimbo, Serra Maze and vicinity, 1208-1229 km north of Cuiabá along Cuiabá-Santarém highway (BR 163), c. 5°55’S, 55°40’W, 100-200 m a.s.l., on mature, tall, humid forest on steep slopes and valleys, with occasional igarapés and igneous rock exposures, 18-22.V.1983, Reese W.D. 16797 (INPA!, NY). See Appendix 1. DISTRIBUTION. — Schusterolejeunea inundata is distributed in the Amazon Forests of Brazil, Colombia, Guyana, Peru, and Venezuela (Grolle 1980; Gradstein et al. 2001; Dauphin et al. 2008; Gradstein 2021). In Brazil, it occurs in northern region (Gradstein et al. 2001), in the states of Amazonas, Pará (Lisboa & Ilkiu-Borges 2001; Santos & Ilkiu-Borges 2022), Maranhão (Peralta et al. 2011), Rondônia and Roraima. HABITAT. — The species Schusterolejeunea inundata is restricted to seasonally inundated habitats in the Amazon and Cerrado biomes as a rheophyte. It forms extensive dark mats on rocks, tree branches, exposed roots, and leaves that are seasonally submerged by black water tributaries (Gradstein & Costa 2003; Gradstein 2020). It was also collected at the edge of the crater lakes of ancient volcanic origin at the Morro dos Seis Lagos (Amazonas state) (Appendix 1). ILLUSTRATIONS. — Spruce 1884; Kachroo 1967 (figs 4; 5) as Cladocolea inundata (Spruce) Schust.; Gradstein et al. 2001 (fig. 53J-L); Gradstein & Costa 2003 (fig. 65A-C); Thiers 1984 (fig. 21); Lisboa & Ilkiu-Borges 2001 (fig. 7). DESCRIPTION Habit Plants small to medium in size, 1-2.5 mm wide, pale to dark green, creeping to loosely pendant, highly branched, with numerous gametangia, usually with fertile innovations. Branches Lejeunea - type. Stems Primary stems 120-135µm in diameter, in cross-section with seven cortical and three medullary cells, cortical cells 25-45 µm in diameter, medullary cells 25-30 µm in diameter; stems with thick-walled cells, epidermis slightly enlarged, without hyalodermis; ventral merophytes two cells wide. Leaves Obliquely spreading, elliptical, (350) 600-1420 (1600) µm long, (160) 280-770 µm wide, 1.5-4 (5) times as long as wide, apices rounded, plane, margins entire, bases of the lobes very narrow, insertion line only 2-3 cells long. Cells pellucid, thinwalled, trigones rare, oil bodies finely granular, 2-4 per cell; ocelli absent. Basal laminal cells long rectangular to fusiform (16-50×9-20µ m), mid laminal cells short rectangular, quadrate, rarely long to short hexagonal (10-25 ×10-20 µm), marginal cells mostly quadrate to short rectangular (10-30 ×10-16µm). Lobules Small narrowly lingulate with a narrow base, plane, narrowly ligulate, 200-418 µm long, 73-116 µm wide, covering 1/8 of the leaf lobes length, keels straight, formed by 2-5 cells, apex rounded broadly expanded (beyond the keel), standing obliquely upward or erect, parallel to stem. Teeth reduced, formed by two cells with a marginal hyaline papillae terminal at the lobule apex. Underleaves Small narrower than the stems (14-27 cells), 2-3× longer than wide (150-280×55-90 µ m), narrowly bifid with erect lanceolate lobes composed of 3-10 cells long, sinus deeply V-shape, lobes at base composed of 2-4 cells wide. Rhizoids brown, up to 11-16 µm wide and thick walls 3 µm wide. Autoicous Gametoecia numerous along the gametophyte. Antheridia on short lateral branches, spikes with 2-6 (8) imbricate pairs of perigonial ovate and bilobed bracts, which are emarginated at their apices. Bracteoles arise as underleaves for each bract pair. Gynoecia 2-4 in a monochasial row, each gynoecium with one pycnolejeuneoid or lejeuneoid innovation which is again fertile (except for the outermost one). Perianths obpyriform, inflated, with five distinct keels, two ventral and three dorsal keels, margins entire. Sporophytes with a 595 µm long and 90 µm thick articulated seta. Capsules globular. Capsule valves with a plurifenestrate pattern. Elaters 1-3 per valve, one attached to the apical cells and others to the margins near the apex of the valve, 165-195 µm long, and 8-14 µm wide with sinuous, incrassated walls, without real spiral bands. Spores green and variable in shape, spherical to rectangular (50-85× 25-35µ m), and surface verruculose. COMMENTS In the field, it can be recognized by its dark green color with a loose and straggling habit, hanging from twigs, or in the base of trees and rocks in black water seasonally flooded igapó forests. Under the dissecting scope, it can be distinguished by its regularly pinnate, and narrow leaves which are widely spaced on their branches. The combination of its short leaf insertion, elongate elliptical to oblong leaves with a flat lobule, small underleaves, and five-keeled perianths in dense clusters, distinguish it from other rheophytic liverworts in the region., Published as part of Sierra, Adriel M. & Zartman, Charles E., 2023, A taxonomic review of the Amazonian rheophyte Schusterolejeunea Grolle (Lejeuneaceae: Cololejeuneinae), with two new combinations, pp. 107-122 in Cryptogamie, Bryologie 20 (4) on pages 110-112, DOI: 10.5252/cryptogamie-bryologie2023v44a4, http://zenodo.org/record/7841602, {"references":["GROLLE R. 1980. - Schusterolejeunea Grolle nom. nov. statt Cladocolea Schust. 1963, non van Tieghem 1895. Journal of Bryology 11 (1): 105 - 106. https: // doi. org / 10.1179 / jbr. 1980.11.1.105","GRADSTEIN S. R., CHURCHILL S. P. & SALAZAR ALLEN N. 2001. - Guide to the bryophytes of Tropical America. Memoirs of the New York Botanical Garden 86: 1 - 577.","DAUPHIN G., MORALES T. & MORENO E. J. 2008. - Catalogo preliminar de Lejeuneaceae (Hepaticae) de Venezuela. Cryptogamie, Bryologie 29 (3): 215 - 265.","GRADSTEIN S. R. 2021. - The Liverworts and Hornworts of Colombia and Ecuador. Memoirs of the New York Botanical Garden 121: 1 - 723. https: // doi. org / 10.1007 / 978 - 3 - 030 - 49450 - 6","PERALTA D. F., BRITO E. S., VARAO L. F., CONCEICAO G. M. & CUNHA I. P. R. 2011. - Novas ocorrencias e lista das briofitas do estado do Maranhao, Brasil. Pesquisa em Foco 19 (1): 63 - 78. https: // ppg. revistas. uema. br / index. php / PESQUISA _ EM _ FOCO / article / view / 403","GRADSTEIN S. R. & COSTA D. P. 2003. - The Liverworts and Hornworts of Brazil. Memoirs of the New York Botanical Garden 87: 1 - 317.","GRADSTEIN S. R. 2020. - The genera of Lejeuneaceae (Marchantiophyta) of tropical America - an update. Nova Hedwigia, Beiheft 150: 81 - 96. https: // doi. org / 10.1127 / nova-suppl / 2020 / 081","SPRUCE R. 1884. - Hepaticae Amazonicae et Andinae. Transactions and Proceedings of the Botanical Society of Edinburgh 15: 1 - 308.","KACHROO P. 1967. - Three new genera of Lejeuneaceae. Philipine Journal of Science 96 (1): 9 - 23.","THIERS B. M. 1984. - Branching in Lejeuneaceae II. Nipponolejeuneoideae, Tuyamaelloideae and Myriocoleoideae. Lindbergia 10 (1): 4 - 18. https: // www. jstor. org / stable / 20149502"]}

Schusterolejeunea saxorum (Spruce) A. M.Sierra & C. E.Zartman, stat. nov., comb. nov. (Fig. 5) Lejeunea inundata var. saxorum Spruce, Transactions and Proceedings of the Botanical Society of Edinburgh 15: 278 (Spruce 1884). LECTOTYPE. — Brazil. Est. Amazonas, San Carlos, in saxis fl. Negro inundatis, leg. Spruce L331/c (lecto-, designated here, MANCH!). SPECIMENS EXAMINED. — Brazil. Amazonas, São Gabriel da Cachoeira, Rio Marié, Marauna, 0°40’00”S, 66°45’00”W, 5.VII.1979, Schuster R. M. 79-13-381 (INPA!); Rio Uaupés, próximo a comunidade de São Pedro, 0°06’43.9”N, 67°39’19.1”W, 19.XII.2017, Sierra A. M. 4760 (INPA!, PMA!); Rio Uaupés, sitio São Paulo, 0°02’50.3”N, 68°29’05.7”W, epífita sobre ramas ao margem do rio, 21.XII.2017, Sierra A. M. 5057 (INPA!, PMA!), 5062 (INPA!, SP!, PMA!); São Gabriel da Cachoeira, 0°40’00”N, 66°40’00”W, sobre galhos submersas na água, 5.VII.1979, Yano O. 1734 (INPA!, SP); Rio Negro, igarapé Foibara, 0°16’18”S, 66°35’00”W, sobre pedras na cachoeira, 22.VII.1979, Yano O. 2150 (INPA!, SP); Amazonas, Novo Airão, Parque Nacional Jaú, Carabinani river, 2°02’38”S, 61°33’28”W, X.2007, Zartman C. E. 7542 (INPA!); Roraima, Caracaraí, Parque Nacional Serra da Mocidade, Rio branco, 1°23’26.2”N, 61°40’19.2”W, 4.III.2017, Zartman C. E. 9790, 9888, 9889, 9892, 9787 (INPA!, PMA!), 9890, 9794 (INPA!, SP!), 9891 (INPA!, SP!, PMA!), 9832 (INPA!). See Appendix 1. DISTRIBUTION. — Schusterolejeunea saxorum (Spruce) A.M.Sierra & C.E.Zartman, stat. nov., comb. nov. is distributed in Amazonas and Roraima states. It is restricted to northern Amazonian tributaries of the Rio Negro: Rio Uaupés, Rio Jaú, Rio Marie (Amazonas state), and Rio Branco (Roraima state) (Appendix 1). HABITAT. — This species is restricted to larger tributaries of the Rio Negro where it grows attached to rocks, branches, and tree trunks subject to seasonally flooding in igapó forests. DESCRIPTION Habit Plants small to medium in size, shoots up to 2 cm long and 0.2-1.5 mm wide, dark yellow to greenish-yellow when fresh, light brown when dry, pendent from leafless stoloniferous branches, shoots attenuate to the apices. Shoots highly branched, with numerous gametangia, usually with fertile innovations. Branches Lejeunea - type. Stems Primary stems 60-75 µm in diameter, in cross-section with 6-7 cortical and three medullary cells, cortical cells 22 µm in diameter, medullary cells 18 µm in diameter; thick-walled cells, epidermis slightly enlarged, hyalodermis lacking; ventral merophytes two cells wide. Leaves Distant, obliquely spreading to slightly erect, insertions short composed of two ventral and 3-4 dorsal cells, lobes (200) 600- 790 (870) µm long, (150) 370-455 µm wide, oblong, 2-3 as long as wide, apices widely rounded to truncate, plane, margins entire. Ventral margins slightly arched. Cells with numerous chloroplasts, oil bodies finely granular, 2-4 per cell; leaf lobe cells rectangular, subquadrate to irregularly polygonal, irregular in shape and size, thin walls, trigones small, intermediate thickenings scarce, cuticles smooth. Apical marginal leaf cells (sub)quadrate (15-25 ×14-25µ m), dorsal marginal cells rectangular to sigmoid-quadrate (13-29 ×9-15 µm), ventral marginal cells irregularly hexagonal (21-35×18-25µm), mid laminal cells hexagonal (18-30 ×15-20µm), with scarce intermediate thickenings, basal cells long rectangular to hexagonal (26-53 ×14-27 µ m), with scarce intermediate thickenings. Stylus unicellular. Lobules Large, well developed, forming a flat fold against the leaf lobe, rectangular to oblong (150) 400-560 µm long, (90) 260-340µm wide, covering 1/3-2/3 of leaf lobes, free margin plane, slightly inflated along the keel, slightly crenate by bulging cells, apices rounded-truncate. Teeth inconspicuous, formed by two cells with a marginal hyaline papillae terminal at the lobule apex. Underleaves Small and narrower than the stem, composed of 14-27 cells, (115) 275-450 ×(62) 95-125 µ m, 3× longer than wide, narrowly bifid with erect lanceolate lobes 8-11 cells long, and 3-5 at lobe base, ending in a 3-5 uniseriate cell, sinus deeply V-shape, rarely asymmetrical with one lobe reduced, forming a triangular fold of nine cells; underleaves usually absent along the basal portion of the stem. Rhizoids hyaline, up to 13 µm wide, and thick walls 4 µm wide. Autoicous Androecia usually on short lateral branches originating at the base of vegetative leaves, or on long terminal branches.Short spikes 590-640×465-520 µ m with 4-5 imbricate pairs of perigonial bracts, 320-360×170-195µ m, bracts emarginated at the apex. Gynoecia on short lateral branches originating at the base of vegetative leaves, in a monochasial row with 1-3 innovations. Female bracts short 330-400 × 295-330 µm, obovate, bilobed, margins entire, with emarginated or obtuse apices. Bracteoles like the underleaves.Perianths obovate 630×460µm, inflated with indistinct keels, at the apex with five indistinct low keels, at the apex slightly swollen forming short auricles, beak short 2-celled. COMMENTS It is readily recognized by its large rectangular to oblong lobules covering greater than half of the leaf lobe length, and its obovate perianth with indistinct keels. Lobule size varies within and between samples. Along a single shoot, the lobule may only cover 1/3 of the leaf surface in some instances and up to 2/3 of the leaf surface in other cases. However, lobules are always rectangular to oblong in S. saxorum (Spruce) A.M.Sierra & C.E.Zartman, stat. nov., comb. nov., contrary to S. inundata var. fontinaloides (Spruce) A.M.Sierra & C.E.Zartman, comb. nov. in which its lobules are triangularly shaped covering less than 1/4 of the leaf surface.

Genus Schusterolejeunea Grolle Journal of Bryology 11: 105-106 (Grolle 1980). DESCRIPTION Plants small to medium size, 1-2.5 mm wide, pale to dark green, creeping to loosely pendent. Stems in cross-section with seven cortical and three medullary thick-walled cells, epidermis slightly enlarged, without hyalodermis. Ventral merophytes are composed of two cells. Leaf lobes obliquely spreading, elliptical, ovate to oblong, 1.5-4 (5) times as long as wide, apices rounded, plane, margins entire, bases of the lobe very narrow, insertion line only 2-3 cells long. Cells pellucid, thin-walled, trigones rare, oil bodies finely granular, 2-4 per cell; ocelli absent. Lobules plane, small to large, variable in shape, when small narrowly lingulate with a narrow base (S. inundata var. inundata: Fig. 2A, B), or triangular (finshaped) (S. inundata var. fontinaloides (Spruce) A.M.Sierra & C.E.Zartman, comb. nov.: Fig. 2C), when large rectangular to oblong (S. saxorum (Spruce) A.M.Sierra & C.E.Zartman, stat. nov., comb. nov.: Fig. 2D, E); hyaline papilla terminal at the apices. Underleaves small (rarely absent in S. saxorum (Spruce) A.M.Sierra & C.E.Zartman, stat. nov., comb. nov.) narrower than the stems, longer than wide, narrowly bifid with erect lanceolate lobes ending in 3-5 uniseriate cells, sinus deeply V-shaped, rarely asymmetrical with one reduced lobe forming a triangular fold consisting of nine cells. Autoicous. Gametoecia numerous along the gametophyte, with either one antheridia or gynoecia branch located below almost every leaf insertion along both sides of the stem (Thiers 1984). Antheridia on short lateral branches, spikes with 2-6 (8) imbricate pairs of perigonial bracts; bracts ovate bilobed, and emarginate at the apices. Bracteoles arise as underleaves for each bract pair. Gynoecia 2-4 in a monochasial row, each gynoecium with one pycnolejeuneoid or lejeuneoid innovation which is again fertile (except for the outermost one). Perianths obpyriform to obovate, inflated, with five distinct (S. inundata) or indistinct low keels (S. saxorum (Spruce) A.M.Sierra& C.E.Zartman, stat. nov., comb. nov.). Without vegetative reproduction., Published as part of Sierra, Adriel M. & Zartman, Charles E., 2023, A taxonomic review of the Amazonian rheophyte Schusterolejeunea Grolle (Lejeuneaceae: Cololejeuneinae), with two new combinations, pp. 107-122 in Cryptogamie, Bryologie 20 (4) on page 110, DOI: 10.5252/cryptogamie-bryologie2023v44a4, http://zenodo.org/record/7841602, {"references":["GROLLE R. 1980. - Schusterolejeunea Grolle nom. nov. statt Cladocolea Schust. 1963, non van Tieghem 1895. Journal of Bryology 11 (1): 105 - 106. https: // doi. org / 10.1179 / jbr. 1980.11.1.105","THIERS B. M. 1984. - Branching in Lejeuneaceae II. Nipponolejeuneoideae, Tuyamaelloideae and Myriocoleoideae. Lindbergia 10 (1): 4 - 18. https: // www. jstor. org / stable / 20149502"]}

Essential oils from the leaves of four species of Piper obtained through hydrodistillation were analyzed using GC-MS andmultivariate data analysis. The chemical analysis enabled the identification of qualitative and quantitative differences among the oils. β-selinene (32.44 ± 1.14%), (E)-nerolidol (44.23 ± 2.23%), β-caryophyllene (19.11 ± 0.40%) and caryophyllene oxide (16.92 ± 0.21%) were identified as the major constituents of the P. mollipilosum, P. brachypetiolatum, P. glandulosissimum and P. madeiranum oils, respectively. The differences in the chemical profiles of the oils were confirmed by principal component analysis. All four species exhibited antioxidant activity. The oil from P. brachypetiolatum achieved the best results on the DPPH test (EC50 = 64.8 µg/ml) and with the ABTS radical (EC50 = 159.7 µg/ml).