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Rindifilum gen. nov. Algae typically have a heterotrichous thallus. Most of the thallus are prostrate and the erect or semi-erect system remains poorly developed. Both the prostrate and upright structures are distinctly irregular in shape. A prostrate very dense system of branched filaments gives rise to an upright system of thinner, also much branched, uniseriate filaments. Prostrate system is formed from rounded/spherical cells often gathered into cell packages. Cells are uninucleate, possess a parietal chloroplast and one pyrenoid. Asexual reproduction by two or four autospores. Sexual reproduction was not observed. Differs from other genera by 18S rRNA and tuf A sequences. Moreover, this genus differs in morphology by the combination of features as the “pear-shaped cells” that develop directly into a “hammer-shaped filament” (Fig. 2 I-L). TYPE SPECIES. — Rindifilum ramosum sp. nov. ETYMOLOGY. — This genus is named in honour of Dr Fabio Rindi, who contributed to the knowledge of green algae, including the order Ulvales., Published as part of Malavasi, Veronica, Klimešová, Michala, Lukešová, Alena & Škaloud, Pavel, 2022, Rindifilum ramosum gen. nov., sp. nov., a new freshwater genus within the Ulvales (Ulvophyceae, Chlorophyta), pp. 125-133 in Cryptogamie, Algologie 20 (8) on pages 128-129, DOI: 10.5252/cryptogamie-algologie2022v43a8, http://zenodo.org/record/7819518

Rindifilum ramosum gen. nov., sp. nov. Rindifilum ramosum gen. nov., sp. nov. with the features of the genus. Thalli up to 0.5 mm consist of prostrate and erected/upright filaments. The vegetative cells of prostrate system are composed by rounded/spherical, pear-shaped or ovoid cells, up to 13.5 µm wide and 13.2 µm long. The pyriform cells of the prostrate system first develop into characteristic “hammer-shaped cells”, up to 77.6 µm long and 33 µm wide. Later on, filaments up to 147 µm long and 4 µm wide are produced. The chloroplast is parietal, usually filling the cell, with a spherical pyrenoid. HOLOTYPE. — Strain SAG 2052 permanently cryopreserved in a metabolically inactive state (cryopreservation in liquid nitrogen) in the Culture Collection of Algae of the Charles University in Prague (CAUP) as the item CAUP J 1701. Living cultures of the alga are maintained at the SAG, University of Göttingen, Germany, with the strain code SAG 2052 (ex-type culture). Illustrations of the holotype are provided in Figure 3. TYPE LOCALITY. — Switzerland. Davos Valley, bank of brook Drusatschabächel, 1570 m a.s.l., 46°49’18”N, 9°51’36”E (1000 m). HABITAT. — Photobiont from lichen Verrucaria margacea (Wahlenb.) Wahlenb. ETYMOLOGY. — L. neut. adj. ramosum, branching, referring to the morphology of the cells., Published as part of Malavasi, Veronica, Klimešová, Michala, Lukešová, Alena & Škaloud, Pavel, 2022, Rindifilum ramosum gen. nov., sp. nov., a new freshwater genus within the Ulvales (Ulvophyceae, Chlorophyta), pp. 125-133 in Cryptogamie, Algologie 20 (8) on pages 129-130, DOI: 10.5252/cryptogamie-algologie2022v43a8, http://zenodo.org/record/7819518

Malavasi, Veronica, Klimešová, Michala, Lukešová, Alena, Škaloud, Pavel (2022): Rindifilum ramosum gen. nov., sp. nov., a new freshwater genus within the Ulvales (Ulvophyceae, Chlorophyta). Cryptogamie, Algologie 20 (8): 125-133, DOI: 10.5252/cryptogamie-algologie2022v43a8, URL: http://dx.doi.org/10.5252/cryptogamie-algologie2022v43a8