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 234670 10.11646/phytotaxa.587.2.1 f3baa327-db9d-4576-b017-96a05242bbed 1179-3163 7731813 19. Cheilolejeunea lobulata (Lindenberg) Gradstein & Bastos (2020: 29) .— Lejeunea lobulata Lindenberg ( in Gottsche et al. 1845: 353 ). Type :— ST. KITTS , “St. Christopher”, Breutel s.n. (isotype G).— Fig. 12S–Z . Cheilolejeunea nana Schuster (1978: 426) , syn. fide Bastos & Gradstein (2020) Cheilolejeunea oncophylla (Ångstrom 1876: 86) Grolle & Reiner (1997: 781) , syn. fide Bastos & Gradstein (2020) Plants light brown to almost yellowish, 0.6–0.9 mm wide. Stems in cross section 60–100 µm in diameter, 7–8 epidermal cells, 113–25 × 18–29 µm; 10–16 medullary cells, 9–18 × 5–11 µm. Ventral merophytes 2 cells wide. Leaves distant to contiguous, ovate to ovate, slightly concave, 330–410 × 240–330 µm; margin entire, apex rounded to obtuse, dorsal margin curve; cells slightly mammillose on the dorsal side and with a low papilla, conspicuous trigones; basal cells 18–27 × 12–18 µm, median cells 17–27 × 12–20 µm, marginal cells 10–18 × 9–16 µm. Lobules inflated, ovate to rectangular, 1/3–2/5 of leaf length, free margin involute, apical tooth acute formed by a long cell, 15–22 × 9–15 µm, keel arched, crenate by mammillose cells. Underleaves distant, orbicular to ovate, 130–200 × 120–170 µm, 1.5–2.5 × stem width, bifid to 1/3 to 1/2, with a V-shaped sinus, margin entire, base cuneate. Autoicous or dioicous. Androecia axillary or terminal, 1–3 pairs of bracts. Gynoecia with pycnolejeuneoid innovations, bracts obovate, 510–550 × 300– 330 µm, apex acute, lobule 300 × 100 µm, bracteole ovate, 390–420 × 350–450 µm, bifid to 1/3. Perianth 5-keeled, generally with very strong keels, beak long. Distribution and habitat :—Neotropical, occurring in Caribbean islands, Costa Rica , Colombia , Venezuela , Peru , Bolivia , Brazil , and Argentina ( Bastos 2017 , Grolle & Reiner- Drehwald 1999). This species is widely distributed in the study area, growing as an epiphyte on tree trunks and branches, in the inter-Andean desert and in semi-desert vegetation, lowland rainforest, lower and upper montane rainforests, grass páramos, and shrub and cushion páramos, between 200–4000 m , in the Guatuso-Talamanca, Puntarenas-Chiriquí, Guajira, Magdalena, and Cauca provinces of the Pacific dominion, and in the Páramo province of SATZ ( Fig. 13 ). Notes :—A variable species, characterized by leaves slightly concave, the apex rounded to obtuse, cells mammillose on the dorsal side whit a low papilla (see Gradstein 2021, Gradstein & Bastos 2022), with conspicuous trigones, and underleaves distant, small 1.5–2 × width stem, bifid up to 1/3, base cuneate, and occasionally with vegetative reproduction by branches caducous ( Grolle & Reiner-Drehwald 1997 ). This species can be confused with C. acutangula (see Gradstein & Bastos 2021 ) but the latter has usually acute leaf apices (not rounded to obtuse) and larger underleaves, 2.5–4 × stem width (not 1.5–2×). Specimens examined :— BRAZIL . Rio de Janeiro : Itatiaia , 2400 m , 12 April 2000 , Costa 3831 ( RB ) ; Rio de Janeiro , Parna Tijuca , 22°56’51”S , 43°17’30”W , 507 m , 19 April 2006 , Santos 456 ( RB ) ; Teresópolis , Parna Serra dos Órg „os, 22°27’66”S, 43°19’90”W, 20 March 2007 , Costa 4679 ( RB ). São Paulo : Cubat „o, 23°51’41”S , 46°27’51”W , 780 m , 27 January 2017 , Prudêncio 457 ( RB ) . COLOMBIA . Antioquia : Guatapé , 6°14’N , 75°10’W , 1850 m , 28 June 1997 , Gutierrez 1281 ( HUA ) ; La Estrella , 6°8’50.4”N , 75°37’47.3”W , 1697 m , Odoñez 151 ( HUA ) ; Medellín , Santa Elena , 6°15’13”N , 72°30’42”W , 2528 m , 30 July 2005 , Londoño 132 ( HUA ) ; Santo Domingo , 1080 m , 24 October 2017 , Ordoñez 635 ( HUA ) ; Sonsón , 5°43’25.1”N , 75°21’35.7”W , 2641 m , 02 November 2013 , Arango 177 ( UDBC ) . Cundinamarca : Páramo El Tablazo , 3500 m , 20 October 1988 , Thiers 5487 ( COL ) . Casanare : Sacama , Road Socha– Sacama , 3050 m , 4 August 2017 , Gradstein 12712 ( COL , UPTC ) . Huila : Acevedo , Macizo colombiano, 1°36’59”N , 76°6’15”W , 2100 m , 29 November 2001 , Castillo 2340 A ( HUA ) . Risaralda : Santa Rosa de Cabal , 4°50’N , 75°31’W , 2970 m , 22 January 1986 , Wolf 643, 723 ( COL ) . Tolima : Santa Isabel , 2950–3520 m , 29 July 1980 , Aguirre-C 1517, 1618 ( COL ) . COSTA RICA . San José : Cerro de la Muerte , 3350 m , 26 December 1999 , Schäfer-Verwimp & Holz SV / H-0160 ( ALCB ) . ECUADOR . Carchi : El Angel - Tulcan Rd. , Voladero , 3900 m , 10 April 1987 , Thiers 4445 ( QCA ) . Loja : Parque Nacional Podocarpus , 2700, 11 November 2009 , Gradstein 12262 ( QCA ) ; Parque Nacional Podocarpus , 4°07’S , 79°10’W , 2900 m , 22 January 2011 , Schafer-Verwimp 31820/ A ( QCA ) . Zamora - Chinchipe : Parque Nacional Podocarpus , 3000–3100 m , 27 April 2008 , Burghardt 7098 ( QCA ) . VENEZUELA . Mérida : Sierra Nevada de Mérida , February 1976 , R . M . Schuster 76-1450 ( F ) ; National Park Sierra Nevada , 3450 m , Schäfer-Verwimp & Verwimp 12325 ( ALCB ) . Tachira : s. of Villa Paez , Betania , 2560 m , 2 March 1976 , Schuster 76-2065b ( F ) .