Cheilolejeunea adnata (Lehmann) Grolle (1977: 529) var. adnata

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, Phytotaxa 587 (2), pp. 73-120 : 82

2.1. Cheilolejeunea adnata (Lehmann) Grolle (1977: 529) var. adnata —

Jungermannia adnata Lehmann (1834: 46) .

Type:— CUBA. In caduce Oreodoxae regiae, Pöppig s.n. (W, lectotype designated by Grolle 1977).— Fig. 2I–M .

Plants yellowish green to light brown, 0.6–0.9 mm wide. Stems in cross section 60–100 µm in diameter, 7–8 epidermal cells, 16–28 × 10–14 µm; 9–10 medullary cells, 9–16 × 5–11 µm. Ventral merophytes 2 cells wide. Leaves subimbricate to imbricate, generally orbicular to ovate, fully flat, 415–500 × 350–500 µm; margin entire; apex broadly rounded; cells orbicular to ovate, cuticle smooth, inconspicuous trigones; basal cells 22–27 × 15–21 µm, median cells 18–29 × 16–20 µm, marginal cells 11–16 × 9–11 µm. Lobules rectangular to ovate, 1/4 leaf length, free margin involute, tooth acute, formed by a cell long, straight to slightly curved, 10 × 25 µm, keel arched. Underleaves distant, orbicular, 1.5–2.5 x wider than the stem, 150–210 × 80–160 µm, bifid to 1/3–1/2, with a V-shaped sinus, margin entire, base cuneate. Dioicous. Androecia on branches, with 5 pairs of bracts. Gynoecia on branches, with a lejeuneoid innovation (sometimes absent), bracteoles obovate, 620 × 390 µm, bifid to 1/8. Perianth 3-keeled, the keels weak, beak short. Vegetative reproduction by means of caducous leaves with hyaline rhizoids on the margin.

Distribution and habitat:—Neotropical, occurring in the Caribbean islands, Costa Rica, Panamá, Colombia, Venezuela, Ecuador ( Gradstein 2020, 2021), Guyana, Suriname, and Brazil ( Bastos 2017). In the study area, generally grows epiphytic on tree trunks and shrubs, below 2000 m, in the lowland rainforest and lower montane rainforest, in the Puntarenas-Chiriquí, Guatuso-Talamanca, Trinidad, Magdalena, Cauca, Chocó-Darién, and Venezuelan provinces of Pacific dominion ( Fig. 3 ).

Notes:—The species is easily distinguished by the presence of deciduous leaves with rhizoids on their margin, lobules ca. 1/4 of the length of the leaf, with a prominent tooth, and distant underleaves, slightly wider than the stem, orbicular, with cuneate bases.

Specimens examined:— BRAZIL. Acre: Alto Juruá , 8°56’11”S, 72°33’50”W, 28 November 2000, Costa 3904 ( RB) . Pernambuco: Recife, Dois Irm „os, 50 m, 3 August 1998, Costa 3366 ( RB). COLOMBIA. Amazonas: Comunidad “ Peña Roja ”, 0°34’S, 72°08’W, 200 m, 14 July 2000, Idárraga, 2477 ( HUA) . Antioquia: Tarazá , 7°33’35.37”N, 75°24’59,41”W, 199 m, February 2017, Buitrago 609439 ( COL) . Cauca: Guapi, Isla Gorgona , 20 m, 11 November 1987, Aguirre-C. 6747 ( COL) . COSTA RICA: Guanacaste. Liberia, National Park Rincon de la Vieja, Trockenwald , 750-800 m, 1 Juary 2000, Schäfer-Verwimp & Holz SV /H-0405 ( ALCB) . PANAMÁ. Barro Colorado: Barro Colorado Island , 120 m, Salazar-A. 15142 ( QCA) . SURINAME. Nickerie: 5°N, 57°W, 150 m, Bekker 1355a ( PMA) .

Figures

FIGURE 2. Cheilolejeunea acutangula A. Cladograph of fertile plants (solid ellipse = androecia, open ellipse = gynoecia with perianth); B& D. Shoot sections in ventral view; C. Perianth, E. Ventral merophyte; F. Leaf and lobule; G. Apex of lobule; H. Leaf lobe cells. Cheilolejeunea adnata var. adnata I. Cladograph of fertile plants (solid ellipse = androecia, open ellipse = gynoecia with perianth); J. Shoot section in ventral view; K. Leaf and lobule; L. Ventral merophyte; M. Leaf lobe cells. Cheilolejeunea adnata var. autoica N. Cladograph of fertile plants (solid ellipse = androecia, open ellipse = gynoecia with perianth); O. Shoot section with gynoecia, in ventral view; P. Perianth with bracteoles; Q. Shoot apex with androecia, in ventral view; R. Ventral merophyte; S. Underleaf; T. Leaf and lobule; U. Lobules; V. Leaf lobe cells. Cheilolejeunea aneogyna W-X. Cladographs of fertile plants (solid ellipse = androecia, open ellipse = gynoecia with perianth, U= gynoecia without perianth); Y. Shoot in ventral view; Z. Perianth with bracts and bracteole; AA. Ventral merophyte; BB. Lobule; CC. Leaf lobe cells.

FIGURE 3. Distribution of Cheilolejeunea acutangula, C.adnata var.autoica, C. adnata var.adnata, and C. aneogyna in Pacific dominion and Páramo province.