Schiffneriolejeunea polycarpa (Nees) Gradst.

Silva, Jainara Pereira, Oliveira-da-Silva, Fúvio Rubens, Ilkiu-Borges, Anna Luiza & Fernandes, Rozijane Santos, 2021, Leafy liverworts of Chapada das Mesas National Park: a floristic survey and checklist of the leafy liverworts of Maranhão state, Brazil, Check List 17 (1), pp. 479-495 : 488

** Schiffneriolejeunea polycarpa (Nees) Gradst.

Material examined. BRAZIL • Maranhão, município de Carolina, Parque Nacional Chapada das Mesas, Rio Farinha , sobre tronco em decomposição na borda de mata de galeria; 06°56′S, 047°20′W; alt. 181 m; 11 Mar. 2017; JAS Silva 22; CCAA 1604 .

Identification. Plants green, brownish to brown (when dry), ca. 2 mm wide. Ventral merophyte of 5–8 cells wide. Leaves suberect to convoluted when dry, widely spreading and convex when moist, imbricate, suborbicular, apex rounded, slightly plane, margin entire; median cells elongated, trigones cordate, cuticle smooth. Lobules ovate, 1/2‒1/3 lobe length, apex oblique, with 1 tooth. Underleaves contiguous to imbricate, entire, 4 × stem width, base rounded, apex truncate to rounded, margin entire. Perianth immersed to 1/3 emergent, obovate, 4 or 5-keeled.

The pantropical genus Schiffneriolejeunea is comprised of 14 species, of which only two were recorded in Brazil, S. polycarpa and S. amazonica Gradst. Differences between these species are mainly in the leaf lobule; see the keys for Schiffneriolejeunea by Gradstein and Costa (2003) and Ilkiu-Borges and Oliveira-da-Silva (2018).

Description and illustration. Gradstein (1994: 71–75, fig. 19).