Otigoniolejeunea huctumalcensis (Lindenb. & Gottsche) Y.M.Wei, R.L.Zhu & 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 : 487-488

** Otigoniolejeunea huctumalcensis (Lindenb. & Gottsche) Y.M.Wei, R.L.Zhu & Gradst.

Material examined. BRAZIL • Maranhão, município de

Carolina, Parque Nacional Chapada das Mesas, Cachoeira São Romão, sobre rocha próximo à queda d’água; 07° 04′S, 047°05′W; alt. 227 m; 6 Jun. 2018; JAS Silva 277; CCAA 1834.

Identification. Plants greenish to pale brownish. Ventral merophyte of 2 cells wide. Leaves imbricate, ovate, apex rounded to subacute, margin entire to crenate; marginal cells convex, trigones medium-sized, cuticle slightly to strongly papillose; ocelli usually 1‒4, suprabasal. Lobules oval to triangular, sometimes reduced, apical tooth obtuse, 1 cell long. Underleaves distant, suborbicular to ovate, 1.5‒2.5 × stem width, bifid, base cuneate, apex subacute, margin entire. Perianth obovoid, 5-keeled, keels entire, bifid or more ramified laciniae. Vegetative reproduction by caducous leaves.

Otigoniolejeunea huctumalcensis is characterized by variable sized shoots, sometimes with narrow and wide shoot sectors occurring in a single plant, leaves with suprabasal ocelli (difficult to see in old herbarium specimens), 5-keeled perianths with ramified horns, vegetative reproduction often by regenerants on leaf margins and occasionally by caducous leaves ( Reiner-Drehwald and Ilkiu-Borges 2007).

Description and illustration. Reiner-Drehwald and Ilkiu-Borges (2007, as Lejeunea huctumalcensis Lindenb. & Gottsche ).