Cheilolejeunea revoluta (Herzog) Gradstein & Grolle

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 : 106

25. Cheilolejeunea revoluta (Herzog) Gradstein & Grolle (in Gradstein et al. 1993: 59).—

Pycnolejeunea revoluta Herzog (1955: 193) .

Type:— COLOMBIA. Santander: Vicin. of Charta , 2000-2600 m, 1–11 February 1927, E. P. Killip 18944 (holotype JE, isotype B-300025994 , G).— Fig. 14Z –FF.

Plants grayish to yellowish green, robust, 1.1–2 mm wide. Stems in cross section 120–300 µm in diameter, 15–18 epidermal cells, 25–48 × 15–30 µm; 29–42 medullary cells, 12–36 × 7–26 µm. Ventral merophytes (5–)6–8 cells wide. Leaves imbricate, orbicular, flat to slightly recurved at the apex, 0.78–1.2 × 0.7–1.1 mm, margin entire, apex rounded to slightly apiculate; cells mammillose on the dorsal side, conspicuous trigones; basal cells 23–42 × 14–34 µm, median cells 22–40 × 19–29 µm, marginal cells 15–23 × 9–23 µm. Lobules triangular to rectangular, 1/6–1/4 of leaf length, apical tooth acute, formed by a long cell 12 × 24 µm, free margin involute, keel straight. Underleaves imbricate, reniform, 360–580 × 620–900 µm, 3–5 × stem width, bifid to 1/6–1/5, with a sinus small, margin revolute, insertion in U-shaped. Dioicous. Androecia intercalary (?) on the principal stem or branches, 3–6 pairs of bracts. Gynoecia on short branches, with 1–2 pycnolejeuneoid innovations, bracts ovate, 1300 × 850 µm, apex acute, bracts lobule 500–160 µm, bracteole obcordate, 920–950 µm, bifid to 1/4. Perianth with 5 strong keels, beak short. Vegetative reproduction unknown.

Distribution and habitat:—Neotropical, occurring in Costa Rica, Colombia, Venezuela, Ecuador, and Brazil ( Bastos 2017, N̂ske et al. 2003). This species grows on tree trunks and in tree canopies as well as on rocks in the study area, in the interior and at the edges of lower montane rainforests, between 700–2650 m (Gradstein 2021), in the Guatuso-Talamanca, Puntarenas-Chiriquí, and Magdalena provinces of the Pacific dominion. The record of C. revoluta occurring in Páramo ( Fig. 16 ), actually belongs to the Cauca province.

Notes: —The species is characterized by plants robust (1.1–2 mm wide), grayish, ventral merophyte 6–8 cells wide, and underleaves reniform, shortly bifid, with revolute apical margin.

Specimens examined:— BRAZIL. Minas Gerais: Morro do Pilar , 19°14’49”S, 43°30’36”W, 1246 m, 27 July 2011, Costa 5296 ( RB) . COLOMBIA. Santander: El Hato , 6°36’10.5”N, 73°21’38,1”W, 2268 m, 25 August 2017, Cuta 145, 507 ( UPTC) . COSTA RICA. Puntarenas: Fila Tigra , 8°56’50”N, 82°5’30”W, 1100 m, Dauphin & Chacón 1990 ( INB) . VENEZUELA. Bolivar: Cerro Guaiaquinima , 4°54’N, 63°27’W, 1250 m, 8 Frebruary 1990, Sipman 26763 ( VEN) .

Figures

FIGURE 14. Cheilolejeunea ovalis A-B. Cladographs of fertile plants (solid ellipse = androecia, open ellipse = gynoecia with perianth) C. Shoot with androecia in ventral view; D. Portion shoot in ventral view E. Shoot with gynoecia in ventral view; F. Ventral merophyte; G. Underleaf; H. Leaf and lobule; I. Leaf lobe cells with trigones. Cheilolejeunea paramicola J-K. Cladographs of fertile plants (solid ellipse = androecia, open ellipse = gynoecia with perianth); L. Shoot with perianth in ventral view; M. Shoot with androecia in ventral view; N. Ventral merophyte; O. Leaf and lobule; P. Underleaf; Q. Leaf lobe cells with trigones. Cheilolejeunea quinquecarinata R. Cladograph of fertile plants (solid ellipse = androecia, open ellipse = gynoecia with perianth) S. Shoot with perianth in ventral view; T. Shoot with androecia in ventral view; U. Ventral merophyte; V. Leaf and lobule; W. Underleaf; X. Apex of lobule; Y. Leaf lobe cells with trigones. Cheilolejeunea revoluta Z-AA. Cladographs of fertile plants (solid ellipse = androecia, open ellipse = gynoecia with perianth) BB. Shoot with perianth in ventral view; CC. Ventral merophyte; DD. Leaf and lobule; EE. Underleaf. FF. Leaf lobe cells with trigones.

FIGURE 16. Distribution of Cheilolejeunea quinquiecarinata and C. revoluta in Pacific dominion and Páramo province