Cheilolejeunea acutangula (Nees) Grolle

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 : 485

** Cheilolejeunea acutangula (Nees) Grolle

Figure 3E

Material examined. BRAZIL • Maranhão, município de Carolina, Parque Nacional Chapada das Mesas, Riacho na RPPN da Mansinha, corticícola em mata de galeria; 07°08′S, 047°26′W; alt. 286 m; 3 Feb. 2020; JAS Silva 442; CCAA 2330 .

Identification. Plants pale green. Ventral merophyte of 2 cells wide. Leaves subimbricate, ovate, apex acute to short acuminate, incurved, margin entire to slightly crenate, dorsal and ventral margin curved; median cells isodiametric, ca. 12‒20 µm, trigones large, dorsal surface of the lobe slightly papillose. Lobules ovate, 1/4 lobe length, apical tooth long, falcate. Underleaves distant, bifid, ovate to orbicular, larger than long or as large as long, 2‒3 × stem width, base cuneate, apex acute, margin ± entire or with a lateral angular tooth. Gynoecia with a pycnolejeuneoid innovation, usually sterile. Perianth obovate, 5-keeled.

Cheilolejeunea acutangula is recognized by leaf lobe apex acute to short acuminate, leaf cells with large trigones and dorsal surface of the lobe slightly papillose. This species is commonly reported for xeric environments.

Description and illustration. Ilkiu-Borges and Oliveira-da-Silva (2018: 995–997, fig. 3a–c).

* Cheilolejeunea adnata (Kunze) Grolle var. adnata Figure 3F

Material examined. BRAZIL • Maranhão, município de Carolina, Parque Nacional Chapada das Mesas, Mata do Buenos Aires , epíxila, na mata ciliar; 06°55′S, 047°22′W; alt. 174 m; 4 Feb. 2020; JAS Silva 455; CCAA 2350 .

* Cheilolejeunea adnata var. autoica Gradst. & Ilk. -Borg.

Material examined. BRAZIL • Maranhão, município de Carolina, Parque Nacional Chapada das Mesas, Rio Farinha , corticícola, mata de galeria, Mansinha; 06°59′S, 047°09′W; alt. 195 m; 6 Jun. 2018; JAS Silva 334; CCAA 1754 .

Figures

Figure 3. Leafy liverworts of the Chapada das Mesas National Park; A. Frullania intumescens; B. Frullania platicalyx; C. Frullania rio-janeirensis; D. Ceratolejeunea cubensis; E. Cheilolejeunea acutangula; F. Cheilolejeunea adnata var.adnata; G. Cheilolejeunea intertexta; H. Cheilolejeunea trifaria; I. Lejeunea juruana; J. Lejeunea quinqueumbonata; K. Metalejeunea cucullata; L. Zoopsidella integrifolia; M. Zoopsidella macella; N. Lophocolea bidentata; O. Plagiochila raddiana; P. Plagiochila simplex (Scale bar: A-B, F-G, P= 20 µm; C-D, H-O= 100 µm; E= 300 µm).