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 13. Cheilolejeunea holostipa (Spruce) Grolle & Zhu (2001: 1071) .— Lejeunea holostipa Spruce (1884: 171) . Type:—BRAZIL. Pará, Spruce L219 (MANCH!, lectotype designated by Grolle & Reiner-Drehwald 1999 ).—Fig. 10A–G. Plants light brown, 0.3–5 mm wide. Stems in cross section 80–100 µm in diameter, 7 epidermal cells and 4–6 medullary cells. Ventral merophytes 2 cells wide. Leaves subimbricate to imbricate, ovate, flat to slightly concave, 230–300 × 200–250 µm; margin entire, apex rounded, dorsal and ventral curved; cells orbicular to ovate, conspicuous trigones (but not very large); basal cells 12–22 × 16–18 µm, median cells 16–18 × 13–16 µm, marginal cells 10–13 × 6–8 µm, smooth. Lobules large, 1/2 of leaf length, ovate, more or less inflated, tooth acute, formed by one long cell, 27 × 6 µm, free margin involute, keel curved, and terminal tooth acute. Underleaves distant, orbicular, 90–100 × 100–110 µm, 1.5–2 × stem width, entire, insertion base cuneate. Dioicous. Androecia in principal stem, with 2–5 pairs of bracts. Gynoecia on short shoots with innovations pycnolejeuneoid, bracts obovate, 400 × 300 µm, apex rounded; lobule 180 × 80 µm, bracteole ovate 330 × 270 µm, bifid to 1/3, generally recurved. Perianth with 5 weak to strong keels in the upper half of the perianth, beak long. Vegetative reproduction unknown. Distribution and habitat :—Neotropical, occurring on Caribbean islands, Mexico , Honduras , Costa Rica , Panamá , Colombia , Venezuela , Guianas, Ecuador , Peru , and Brazil ( Bastos 2017 , Schäfer-Verwimp 1999 ). This species grows on tree trunks in the study area, in lowland rainforest, lower and upper montane rainforests, between 700–3000 m , in the Guatuso-Talamanca, Puntarenas-Chiriquí, Guajira, Magdalena, and Cauca provinces of the Pacific dominion. The record of C. holostipa occurring in the Páramo ( Fig. 11 ), actually belongs to the Cauca province. Notes :—This species can be recognized as small plants (<600 µm wide), with ventral merophytes 2 cells wide and underleaves distant and fully entire. The section Cyrtolejeunea is composed of two species in the Neotropics, C. holostipa and C. insecta ; the latter species differs by a slightly bifid underleaf and the presence of bracteoles throughout the male spike ( Bastos & Gradstein 2020 ) and does not occur in the study area. Specimens examined :— BRAZIL . Pará : Capit „o Poço , 1°46’S , 47°4’W , 40 m , 15 September 2016 , Tavares 1025 ( RB ) . Rio de Janeiro : Rio de Janeiro , PARNA Tijuca , 22°57’28”S , 43°16’40”W , 446 m , 19 July 2016 , Santos 551 ( RB ) . Santa Catarina : Blumenau , Nova Rússia , 27°3’7”S , 49°5’16”W , 281 m , 17 November 2003 , Costa 4687 ( RB ) . COLOMBIA . Antioquia : Cocorna , 6°2’40.29”N , 75°7’46.46”W , 964 m , 19 August 2016 , Ordoñez 251 ( HUA ) ; San Luis , 811 m , 12 June 2018 , Carvajal 11 ( HUA ) ; Santo Domingo , January 2018 , Ordoñez 625 ( HUA ) . Cundinamarca : Ubalá , 754 m , 26 July 2018 , Carmona s.n. ( HUA ) . Magdalena : Santa Marta , Cuchilla de San Lorenzo , S . Winkler C227 ( COL ) . Risaralda : El Pital , 4°51’N , 75°45’W , 1500 m , 8 November 1986 , Wolf 1226 ( COL ) . Santa Rosa de Cabal , 4°50’N , 75°31.5’W , 2740 m , 4 June 1986 , Wolf 1572 ( COL ) . ECUADOR . Loja : Loja , Parque Nacional Podocarpus , 2700 m , 11 November 2009 , Gradstein 12261 ( QCA ) . PANAMÁ . Chiriqui : Straβe von El Volcán , 8°49,67’ N , 82°42.85’ W , 1220 m , 3 April 2013 , Schäfer-Verwimp & Werwimp 34702 ( ALBC ) .