Cheilolejeunea trifaria var. clausa Bastos & Gradstein
Creators: name: Gil-Novoa, Jorge Enrique
name: Costa, Denise Pinheiro
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Plantae
Marchantiophyta
Jungermanniopsida
Porellales
Lejeuneaceae
Cheilolejeunea
Cheilolejeunea trifaria
Cheilolejeunea trifaria var. clausa (nees &amp; mont.) bastos &amp; gradstein

description: 29.2 Cheilolejeunea trifaria var. clausa (Nees & Mont.) Bastos & Gradstein (41: 2020):—
Lejeunea clausa Nees & Mont. (in Montagne 1840: 337).
Type:— FRENCH GUIANA. Mt. Serpent, April 1838, Leprieur 276 (holotype PC).— Fig. 20A–J.
Cheilolejeunea clausa (Nees & Montagne) Schuster (1980: 863), syn. fide Bastos & Gradstein (2020)
Plants yellowish green to dark brown, 0.8–1.2 mm wide. Stems in cross section 75–110 µm in diameter, 7(–8) epidermal cells, 25–40 × 10–28 µm; 10–12 medullary cells, 15–24 × 8–11 µm. Ventral merophytes 2 cells wide. Leaves imbricate, ovate-orbicular, fully flat to slightly convex, 470–600 × 350–480 µm; apex rounded; margin entire or with slightly projecting cells, dorsal and ventral margins curved; cells orbicular to ovate, slightly mammillose on dorsal side, with conspicuous trigones; basal cells 22–40 × 15–28 µm, median cells 15–38 × 15–25 µm, marginal cells 12–24 × 10–16 µm. Lobules trapezoid, 1/4–1/3 of leaf length, free margin involute, tooth short and acute, formed by one cell, keel arched. Underleaves slightly distant to subimbricate, orbicular, 180–400 × 230–580 µm, 3–4 × stem width, bifid to 1/3, V-shaped sinus, lobes acute, margins entire, base auriculate, insertion arched. Dioicous. Androecia commonly intercalary, 3–4 pairs of bracts. Gynoecia with lejeuneoid innovations, bracts oblong, 600 × 280 µm, apex rounded and margin entire, lobule 170 × 210 µm, bracteole ovate 300 × 520 µm, bifid to 1/7, usually recurved. Perianth 5-keeled, beak short. Vegetative reproduction by caducous leaves.
Distribution and habitat:—Neotropical, occurring in United States, Bermuda, Guatemala, Honduras, Jamaica, Colombia, Venezuela, French Guiana, Ecuador, Brazil, and Paraguay (Bastos 2017, Campos et al. 2014). This species usually grows as an epiphyte in the study area, on the trunks of trees in lowland rainforest, lower and upper montane rainforests, between 150–2500 m, in the Puntarenas-Chiriquí, Guatuso-Talamanca, Venezuelan, Magdalena, and Chocó-Darién provinces of the Pacific dominion. The records of C. trifaria var. clausa occurring in the Páramo (Fig. 21), actually belongs to the Cauca province.
Notes: —The variety is characterized by underleaves orbicular, dioicous sexuality, and vegetative reproduction occasionally by caducous leaves differentiating it from C. trifaria var. trifaria, which is autoicous and lacks caducous leaves.
Specimens examined:— BRAZIL. Acre: Tarauacá, 8°30’84”S, 71°27’83”W, 19 November 1995, Costa 2654 (RB). Pernambuco: Caruaru, 950 m, 10 August 1998, Costa 3426 (RB). Rio de Janeiro: Santa Maria Madalena, Marquete 2383 (RB). São Paulo: Cubat „o, Núcleo Itutinga-Pilıes, 23°53’23”S, 46°29’51”W, 130 m, 19 October 2016, Prudêncio 178 (RB). COLOMBIA. Antioquia: Ituango, 7°14’8.07”N, 75°27’35.41”W, 197 m, 30 September 2015, Trujillo 7331 (HUA); Puerto Nare, 552 m, May 2018, Ordoñez 852 (HUA); San Carlos, 192 m, May 2018, Ordoñez 851 (HUA). Meta: Villavicencio, Vereda Santa María la Baja, 04°13’27”N, 73°38’10”W, 653 m, 06 April 2016, Gómez 937 (LLANOS). COSTA RICA. Heredia: Atlantic slope, near Vara Blanca, Svilha 45–640 (NY). Cartago: Atlantic slope, Turrialba, 870 feet, 10–12, October 1947, Svilha 47-769 (NY).
description: Published as part of Gil-Novoa, Jorge Enrique & Costa, Denise Pinheiro, 2023, Synopsis of the species of Cheilolejeunea (Marchantiophyta, Lejeuneaceae) in the Pacific dominion and Páramo province of tropical America, pp. 73-120 in Phytotaxa 587 (2) on pages 111-113, DOI: 10.11646/phytotaxa.587.2.1, http://zenodo.org/record/7731813