Lejeunea juruana Gradst. & M.E.Reiner

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 : 487

*** Lejeunea juruana Gradst. & M.E.Reiner

Figure 3I

Material examined. BRAZIL • Maranhão, município de Carolina, Parque Nacional Chapada das Mesas, Cachoeira São Romão, sobre tronco vivo; 07°04′S, 047° 05′W; alt. 227m; 6 Jun. 2018; JAS Silva 305; CCAA 1518 .

Identification. Plants pale green to brownish. Ventral merophyte of 4 cells wide. Leaves contiguous, insertion of leaf lobes very long, ovate, apex rounded, margin entire, dorsal margin slightly arched, ventral margin straight; median cells isodiametric, trigones small, cuticle smooth. Lobules frequently reduced, when welldeveloped with a 2–4 cells long tooth, keel straight. Underleaves distant, bifid, ovate, small, 1.5‒2 × stem width, base cuneate, apex acute, margin entire, plane. Perianth obovate, 5-keeled, keels smooth.

Lejeunea juruana is a rare species mainly characterized by ventral merophyte of four cells wide, leaves with a very long insertion line, and underleaves very small. This species is also known by the numerous short male and female branches on both sides of the stem. All examined specimens of L. juruana in the study area were fertile.

This species was only known to the Amazonas (type locality), Mato Grosso ( Bastos and Gradstein 2020) and São Paulo state ( Peralta and Yano 2008, as Neopotamolejeunea uleana (Steph.) M.E.Reiner ).

Description and illustration. Reiner-Drehwald (2000a: 452–455, fig. 2, as Neopotamolejeunea uleana ).

** Lejeunea quinqueumbonata Spruce Figure 3J

Material examined. BRAZIL • Maranhão, município

de Carolina, Parque Nacional Chapada das Mesas, Rio Farinha, cachoeira São Romão, sobre rochas; 06°59′S, 047°09′W; alt. 228 m; 11 Mar. 2017; JAS Silva 116; CCAA 1741.

Identification. Plants yellowish to light green. Ventral merophyte of 2 cells wide. Leaves contiguous to imbricate, ovate to ovate-oblong, apex rounded to obtuse, margin crenate, dorsal margin arched, ventral margin straight to slightly arched; median cells isodiametric to elongate, convex, trigones absent, cuticle smooth. Lobules frequently reduced or rectangular when well-developed, with a tooth 1 or 2 cells long. Underleaves distant, bifid, 2.5‒4 × stem width, base cuneate to rounded, apex subacute, margin crenate, plane. Perianth subcylindrical, 1/3–1/2 emergent, 5-keeled, keels short.

The main characters that distinguish L. quinqueumbonata are the strongly crenate margins of the leaves, underleaves, and bracts and the slender cell walls ( Reiner-Drehwald 2000b).

Description and illustration. Reiner-Drehwald (2000b: 112–115, fig. 14).

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).