Leafy liverworts of Chapada das Mesas National Park: a floristic survey and checklist of the leafy liverworts of Maranhão state, Brazil Author Silva, Jainara Pereira Laboratório de Sistemática Vegetal, Centro de Ciências Agrárias e Ambientais, Universidade Federal do Maranhão, Chapadinha, MA, Brazil Author Oliveira-da-Silva, Fúvio Rubens Programa de Pós-graduação em Ciências Biológicas, Botânica Tropical, Universidade Federal Rural da Amazônia / Museu Paraense Emílio Goeldi, Belém, PA, Brazil • FROS: oliveira. fuvio @ gmail. com https: // orcid. org / 0000 - 0002 - 4871 - 6740 &): 479 - 495. https: // doi. org / 10.15560 / 17.2.479 Author Ilkiu-Borges, Anna Luiza Museu Paraense Emílio Goeldi, Belém, PA, Brazil • ALIB: ilkiu-borges @ museu-goeldi. br https: // orcid. org / 0000 - 0002 - 1266 - 7211 Author Fernandes, Rozijane Santos Laboratório de Sistemática Vegetal, Centro de Ciências Agrárias e Ambientais, Universidade Federal do Maranhão, Chapadinha, MA, Brazil text Check List 2021 2021-03-11 17 1 479 495 journal article 10.15560/17.1.479 1809-127X 5380155 ** Cheilolejeunea trifaria (Reinw, Blume & Nees) Mizut. Figure 3H Material examined. BRAZIL • Maranhão , município de Carolina, Parque Nacional Chapada das Mesas, Riacho Buenos Aires, corticícola, ilha da Cachoeira do Prata; 06°56′S , 047°20′W ; alt. 228 m ; 30 Oct. 2017 ; JAS Silva 149; CCAA 1567. Identification. Plants olive-green. Ventral merophyte of 2 cells wide. Leaves subimbricate, suborbicular, apex rounded, plane to slightly incurved, margin entire or sinuate, dorsal and ventral margin curved; median cells isodiametric, ca. 20‒25 µm, trigones small to large. Lobules ovate to elongate (usually hidden behind the underleaves), 1/3‒1/2 lobe length, apical tooth short. Underleaves contiguous to subimbricate, bifid to 1/3‒1/2 of length, ovate, larger than long, 3‒6 × stem width, base broadly rounded with insertion line deeply arched, apex acute, margin entire. Gynoecia with 1‒2 lejeuneoid innovation, often fertile. Perianth obovate, 5-keeled. Cheilolejeunea trifaria is easily recognized by relatively large plants with suborbicular leaf lobes, lobules ovate to elongate, hidden behind the large underleaves (3‒6 × stem width). Description and illustration. Gradstein and Ilkiu- Borges (2009: 68, fig. 38e–g).