Plagiochila steyermarkii H.Rob.

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 : 62

*** Plagiochila steyermarkii H.Rob.

( Fig. 4 I-J)

SPECIMENS EXAMINED. — Uei tepui, Bonnetia woodland, on tree trunk, 5°01’30”N, 60°36’45”W, alt. 2103 m, Viana et al. 6261; on ferns, Viana et al. 6275.

REMARKS

Plagochila steyermarkii is a rather rare neotropical species that has been recorded from Venezuela, Guyana, Cuba and Dominica, growing on trees and rock in montane rainforest at 960-2200 m ( Robinson 1965; Schäfer-Verwimp 1999; Grolle & Heinrichs 1999; Rico & Pócs 2004). The species is recognized by the small plants with distant, deeply bifid (to 1/2-2/3) and frequently caducous leaves, and thick-walled leaf cells with large trigones.

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.