Cheilolejeunea ornata Bastos (2011: 86)

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 : 101-103

21. Cheilolejeunea ornata Bastos (2011: 86) .

Type:— BRAZIL. Bahia: Igrapiúna, Reserva Ecologica Michelin , 13°48’S, 39°10’W, Fragmento Pacangê , Floresta Atlântica , 11 August 2006, C. Bastos 4681 (holotype ALCB!) .

Plants light brown, 0.4–0.55 mm wide. Stems in cross section 40–50 µm in diameter, 7–8 epidermal cells, and 5–7 medullary cells. Ventral merophytes 2 cells wide. Leaves contiguous to subimbricate, orbicular to ovate-elongate with flat to strongly recurved apex, 200–250 × 150–190 µm; margin slightly dentate by projecting cells; apex acute to apiculate, ending in one or two cells; dorsal margin plane to recurved, ventral margin strongly curved; cells oblong to more commonly ovate, strongly papillose by one large papilla on the dorsal side, trigones usually conspicuous; basal cells 16–25 × 12–18 µm, median cells 15–21 × 10–15 µm, marginal cells 8–12 × 8–11 µm. Lobules fully inflated, triangular-ovoid, 1/3 of leaf length, free margin involute, tooth acute, formed by a triangular cell; keel arched, strongly papillose. Underleaves long distant, obovate, small, 80–0 × 80–100 µm, 1.5–2x stem width, bifid to 1/4–1/3, with a V-shaped sinus, apex of lobules obtuse, margin entire, insertion curved. Possibly dioicous. Androecia on shortspecialized branches, 2–3 pairs of orbicular or inflated bracts. Gynoecia not seen.

Distribution and habitat:—This is a rare species, distributed in the Brazilian Amazon Forest, in lower montane rainforest of Ecuador and in Cuba ( Cañiza-Ovelar & Bastos, 2022). This species grows at 1890 m in the Cauca province of the Pacific dominion province (not in the Páramo province, Fig. 13 ), on bark of trees in lower montane rainforest ( Gradstein & Benitez, 2017).

Notes:—The species is characterized by the size of the plants, generally narrower than 500 µm, ventral merophyte 2 cells wide, cells of lobe, lobule and keel strongly papillose by one large papilla, and underleaves small, distant, 1.5– 2× stem width. It is very likely that the species has a wider distribution range in the Andes. The species is considered here as Data Deficient-new (DD-n) ( Sérgio et al. 2007, UCN 2001).

Specimens examined:— BRAZIL. Bahia: Porto Seguro , 17°53’S, 39°24’W, 180 m, 5 July 1990, SchäferVerwimp & Verwimp, 12890/ A ( ALCB) . Roraima: Caracaraí, Serra da Mocidade , 600 m, Araújo 1217a ( ALCB) .

Figures

FIGURE 13. Distribution of Cheilolejeunea laevicalyx, C. lineata, C. lobulata, C. norisiae, and C. ornata in Pacific dominion and Páramo province.