Micropterygium bialatum Fulford

Oliveira-Da-Silva, Fúvio Rubens, Gradstein, S. Robbert, Viana, Pedro Lage, G., Carlos Ernesto, Schaefer, R. & Ilkiu-Borges, Anna Luiza, 2022, Bryophytes from Uei tepui (Serra do Sol), with liverworts new to Brazil and the description of Leptoscyphus incisus sp. nov., Cryptogamie, Bryologie 20 (4), pp. 51-64 : 58-60

*** Micropterygium bialatum Fulford

( Fig. 4 C-E)

SPECIMENS EXAMINED. — Uei tepui, woodland in crevice, on Polypodiaceae , 5°00’25”N, 60°36’52”W, alt. 2046 m, Viana et al. 6275; on rock, 5°00’25”N, 60°36’52”W, alt. 2046 m, Viana et al. 6276.

REMARKS

Micropterygium bialatum is only known from the tepuis of Venezuela ( Fulford 1966; Dauphin & Ilkiu-Borges 2002; Morales et al. 2007), growing on moist soil, sandstone bluffs and bases of trees at 1700-2300 m. This species can be distinguished by underleaves decreasing in size toward the apex of ascending branches, leaves ovate with a 2-winged keel, leaf apex often shortly bifid (by 1-2 cells) and dorsal cell surface with a low papilla ( Fulford 1966).

Figures

FIG. 4. — Liverworts new to Brazil. A, B, Syzygiella campanulata Herzog: A, habit, ventral view; B, leaf cells showing papillose cuticle. C-E, Micropterygium bialatum Fulford: C, leaf apex with papillae; D, habit, ventral view; E, leaf cells with papillae. F-H, Micropterygium tumidulum Fulford: F, leaf apex; G, habit, ventral view; H, leaf cells with papillae. I-J, Plagiochila steyermarkii H.Rob.: I, habit; J, leaf cells. A, B, from Viana et al. 6261; C-E from Viana et al. 6275; F-H from Viana et al. 6278; I-J from Viana et al. 6261. Scale bars: A, D, G, I, 100 µm; B, C, E, F, H, J, 50 µm.