Cheilolejeunea aneogyna (Spruce) Evans (1900: 440)

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 : 83

3. Cheilolejeunea aneogyna (Spruce) Evans (1900: 440) .—

Lejeunea aneogyna Spruce (1884: 254) .

Type:— VENEZUELA. San Carlos, in ramulis et mortuis, R. Spruce L103 (MANCH!, lectotype designated by Grolle 1979).— Fig. 2W –CC.

Cheilolejeunea assurgens ( Spruce 1884: 256) Stephani (1914: 651) , syn. fide Bastos (2012a).

Plants dark brown to yellowish brown, often 0.9 mm wide. Stems in cross section 60–80 µm in diameter, 7–8 epidermal cells in cross section, 16–20 × 7–11 µm; 9–10 medullary cells, 8–11 × 4–7 µm. Ventral merophytes 2 cells wide. Leaves subimbricate, orbicular to ovate, fully flat to slightly recurved at the apex, 440–480 × 340–400 µm; margin entire, apex rounded; cells smooth, inconspicuous trigones; basal cells ovate, 19–24 × 12–17 µm, median cells 15–20 × 9–14 µm, marginal cells 10–14 × 9–11 µm. Lobules ovoid to almost rectangular, ca. 1/4 of leaf length, with two teeth prominent and obtuse, usually overlapping each other; free margin slightly involute, keel arched. Underleaves distant to contiguous, orbicular to ovate, 2–3 x wider than the stem, 200–260 × 180–240 µm, bifid to 1/3, with a V-shaped sinus, margin entire, base cuneate. Autoicous. Androecia on short-specialized branches or intercalary on long shoots, 3–6 pairs of bracts. Gynoecia on branches, without innovations, bracts obovate, 350 × 200 µm, apex rounded, lobule 120 × 230 µm, bracteole ovate, slightly smaller than bracts, bifid to 1/8. Perianth with 4 prominent keels at the apex, beak short. Vegetative reproduction by caducous leaves.

Distribution and habitat:—Neotropical, occurring in Panamá, Colombia, Bolivia, Venezuela, Ecuador, Brazil, and Jamaica ( Bastos 2017, Campos et al. 2014, Schäfer-Verwimp et al. 2013). In the study area, this species generally grows on tree trunks, in lowland rainforest and lower montane rainforest, between 20–800(–1400) m, in GuatusoTalamanca, Magdalena, and the Ecuadorian provinces of Pacific dominion ( Fig. 3 ).

Notes:—Characterized by the presence of two lobule teeth, with the first tooth usually covering the second tooth (requiring observation of many lobules). Bastos & Gradstein (2020) described a new variety, C. aneogyna var. riparia , characterized by dioicous sexuality and pycnolejeuneoid innovations, and being restricted to Amazonian forests. This variety might possibly occur in the study area as well but has not yet been recorded there.

Specimens examined:— BRAZIL. Amazonas: Manaus , 3°03’39”S, 60°00’47”W, 90 m, 8 August 1974, Griffin III 772 ( COL) . São Paulo: Praia Grande , 24°0’46”S, 46°33’46”W, 20-780 m, 25 August 2016, Prudêncio 86 ( RB) . COLOMBIA. Amazonas: Comunidad “Peña Roja”, 0°34’S, 72°08’W, 200 m, 14 July 2000, Idárraga 24318, 2432, 2442, 2482 ( HUA) . Antioquia: Yondó , 6°42’2.9” N, 74°24’54.1” W, 109 m, 26 November 2017, Larrota 10897 ( COL) . Cundinamarca: Guaduas , 1388 m, 1 September 2017, Malagón 850 ( COL) . ECUADOR. Guayas: Camacho , 2°48.6’S, 79°38.9’W, 100 m, 14 March 2012, Schafer-Verwimp s.n. ( QCA) .

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.