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Myrcia capixabaand M. forzzae, two new species from the large Neotropical genus Myrcia, are here proposed, described, and illustrated. Both species belong to Myrciasect. Aguavaand are morphologically quite distinct from the other species of the section. Myrcia capixabaoccurs in the Atlantic Forest of Espírito Santo and presents a set of features that do not overlap with any other species within M.sect. Aguava: dibrachiate trichomes on the branches, leaves, and inflorescences and externally on the flowers, broadly elliptic to ovate leaves with flat, barely visible secondary venation adaxially, and subterminal panicles. Myrcia forzzaeoccurs in the Amazon Forest of Mato Grosso and resembles M. gigas, differing in the shorter internodes, vegetative branches and inflorescence rachises densely covered with trichomes (vs. with scattered trichomes or glabrous), and calyx lobes bearing trichomes externally (vs. glabrous).

Leucoagaricus taniae(Agaricaceae) is described as new to science. It was found growing in sand at Armação beach on Santa Catarina Island in Southern Brazil covered by sand among Canavalia rosea(Fabaceae) and Cyperus pedunculatus(Cyperaceae). The new species has a cream white pileus that is up to 50 mm in diameter and exudes golden drops when fresh. The stipe is up to 60 mm height, with rhizomorphs at the end of the volvate base. Photographs of fresh basidiomes in situ and illustrations of the main micromorphological features are presented. A molecular-phylogenetic analysis that includes the species is also presented.

Two new species of Myrciasect. Reticulosae, M. carassanaand M. revolutaare here described and illustrated. Myrcia carassanawas firstly recognized in 1908 by A. F. M. Glaziou but never validly published. This species is similar to M. venosissimabut differs by reddish trichomes, inflorescences botryoid or reduced to simple dichasia with longer peduncles, obconic floral buds and calyx lobes internally densely pilose. Myrcia revolutaresembles M. reticulosabut differs by leaves strongly revolute, densely pilose abaxially when mature, and subterminal inflorescences subtended by reduced leaves.