Synopsis of the species of Cheilolejeunea (Marchantiophyta, Lejeuneaceae) in the Pacific dominion and Páramo province of tropical America Author Gil-Novoa, Jorge Enrique Programa de Pós-graduação em Botânica, Escola Nacional de Botânica Tropical, Instituto de Pesquisas Jardim Botânico do Rio de Janeiro. Rua Pacheco Leão, Horto, 2040, 22460 - 080, Rio de Janeiro-RJ, Brazil. & Grupo Sistemática Biológica, Herbario UPTC, Universidad Pedagógica y Tecnológica de Colombia, Tunja, Boyacá, Colombia. Author Costa, Denise Pinheiro 0000-0001-9495-3029 Instituto de Pesquisas Jardim Botânico do Rio de Janeiro - IPJBRJ, Rua Pacheco Leão 915, 22460 - 030, Rio de Janeiro, RJ, Brazil. denisepinheirodacosta @ gmail. com; https: // orcid. org / 0000 - 0001 - 9495 - 3029 denisepinheirodacosta@gmail.com text Phytotaxa 2023 2023-03-14 587 2 73 120 http://dx.doi.org/10.11646/phytotaxa.587.2.1 journal article 10.11646/phytotaxa.587.2.1 1179-3163 7731813 21. Cheilolejeunea ornata Bastos (2011: 86) . Type :— BRAZIL . Bahia : Igrapiúna , Reserva Ecologica Michelin , 13°48’S , 39°10’W , Fragmento Pacangê , Floresta Atlântica , 11 August 2006 , C . Bastos 4681 ( holotype ALCB !) . Plants light brown, 0.4–0.55 mm wide. Stems in cross section 40–50 µm in diameter, 7–8 epidermal cells, and 5–7 medullary cells. Ventral merophytes 2 cells wide. Leaves contiguous to subimbricate, orbicular to ovate-elongate with flat to strongly recurved apex, 200–250 × 150–190 µm; margin slightly dentate by projecting cells; apex acute to apiculate, ending in one or two cells; dorsal margin plane to recurved, ventral margin strongly curved; cells oblong to more commonly ovate, strongly papillose by one large papilla on the dorsal side, trigones usually conspicuous; basal cells 16–25 × 12–18 µm, median cells 15–21 × 10–15 µm, marginal cells 8–12 × 8–11 µm. Lobules fully inflated, triangular-ovoid, 1/3 of leaf length, free margin involute, tooth acute, formed by a triangular cell; keel arched, strongly papillose. Underleaves long distant, obovate, small, 80–0 × 80–100 µm, 1.5–2x stem width, bifid to 1/4–1/3, with a V-shaped sinus, apex of lobules obtuse, margin entire, insertion curved. Possibly dioicous. Androecia on shortspecialized branches, 2–3 pairs of orbicular or inflated bracts. Gynoecia not seen. Distribution and habitat :—This is a rare species, distributed in the Brazilian Amazon Forest, in lower montane rainforest of Ecuador and in Cuba ( Cañiza-Ovelar & Bastos, 2022 ). This species grows at 1890 m in the Cauca province of the Pacific dominion province (not in the Páramo province, Fig. 13 ), on bark of trees in lower montane rainforest ( Gradstein & Benitez, 2017 ). FIGURE 14. Cheilolejeunea ovalis A-B. Cladographs of fertile plants (solid ellipse = androecia, open ellipse = gynoecia with perianth) C. Shoot with androecia in ventral view; D. Portion shoot in ventral view E. Shoot with gynoecia in ventral view; F. Ventral merophyte; G. Underleaf; H. Leaf and lobule; I. Leaf lobe cells with trigones. Cheilolejeunea paramicola J-K. Cladographs of fertile plants (solid ellipse = androecia, open ellipse = gynoecia with perianth); L. Shoot with perianth in ventral view; M. Shoot with androecia in ventral view; N. Ventral merophyte; O. Leaf and lobule; P. Underleaf; Q. Leaf lobe cells with trigones. Cheilolejeunea quinquecarinata R. Cladograph of fertile plants (solid ellipse = androecia, open ellipse = gynoecia with perianth) S. Shoot with perianth in ventral view; T. Shoot with androecia in ventral view; U. Ventral merophyte; V. Leaf and lobule; W. Underleaf; X. Apex of lobule; Y. Leaf lobe cells with trigones. Cheilolejeunea revoluta Z-AA. Cladographs of fertile plants (solid ellipse = androecia, open ellipse = gynoecia with perianth) BB. Shoot with perianth in ventral view; CC. Ventral merophyte; DD. Leaf and lobule; EE. Underleaf. FF. Leaf lobe cells with trigones. Notes :—The species is characterized by the size of the plants, generally narrower than 500 µm, ventral merophyte 2 cells wide, cells of lobe, lobule and keel strongly papillose by one large papilla, and underleaves small, distant, 1.5– 2× stem width. It is very likely that the species has a wider distribution range in the Andes. The species is considered here as Data Deficient-new (DD-n) ( Sérgio et al. 2007 , UCN 2001). Specimens examined :— BRAZIL . Bahia : Porto Seguro , 17°53’S , 39°24’W , 180 m , 5 July 1990 , SchäferVerwimp & Verwimp , 12890/ A ( ALCB ) . Roraima : Caracaraí , Serra da Mocidade , 600 m , Araújo 1217a ( ALCB ) .