Micropterygium tumidulum 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 : 60

*** Micropterygium tumidulum Fulford

( Fig. 4 F-H)

SPECIMEN EXAMINED. — Uei tepui, woodland in crevice, on soil, 5°00’25”N, 60°36’52”W, alt. 2046 m, Viana et al. 6278.

REMARKS

Micropterygium tumidulum is a rare tepui species reported from Auyan tepui ( Fulford 1966), Cerro Venamo ( Dauphin & Ilkiu-Borges 2002) and Cerro Marutani ( Morales et al. 2007) in Venezuela, and Mount Roraima in Guyana ( Gradstein & Florschütz-de Waard 1989). This species usually grows on sandstone and dry bark in montane scrub at 1200-2300 m. Micropterygium tumidulum is distinguished by underleaves decreasing in size to the apex of ascending branches, leaves ovate an evenly folded from base to apex, cell surface papillose and cell walls with nodulose trigones ( 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.