Campylopus luteus (Müll. Hal.) Paris

J. Florschutz-de Waard, H. R. Zielman & M. A. Bruggeman- Nannenga, 2011, Flora of the Guianas, Series C, fascicle 2., Kew: Kew Publishing : 9

7. Campylopus luteus (Müll. Hal.) Paris , Index Bryol. 254. 1894.

- Thysanomitrium luteum Müll. Hal. , Linnaea 42: 470. 1879. Lectotype (Frahm 1991): Venezuela, Tovar, Fendler 39 (H, BR) WW _

Robust plants growing in loose tufts. Stems 10 cm or more long, tomentose below. Leaves Spreading, to 12 mm long and 1.2 mm Wide, slenderly lanceolate With an ovate basal pan ca. l/4 of the leaf length, abruptly narrowed to a long, narrow subula; costa filling more than half the leaf base, excurrent and toothed at apex, in cross-section with wide hyalocysts ventrally and dense groups of stereids dorsally; alar cells inflated and Coloured forming large auricles, inner basal lamina] cells just above the auricles thin-Walled or slightly incrassate, rectangular, towards margin linear, forming il hyaline border along the basal lamina, Cells in upper part of the basal lamina incrassate, Sigmoid-oblong; upper lamina very narrow, 2-3 cells wide, extending nearly to apex, sharply serrate in upper pan Sporophyte (description after Frahm 1991); sera 8- 10 mm long, capsule curved, 2 mm long, Operculum obliquely rostrate; calyptra fringed at base.

Distribution: Colombia, Venezuela, Guyana, Bolivia.

Ecology: Terrestrial, on wet rocks; collected in the Guianas only from a single locality in Guyana, at high altitude in humid mossy forest.

Specimens examined: Guyana: N slope of Mt. Roraima alt. 1200- 1 600 m, Aptroot 17112, Gradstein 5336, 5379 (L).

Note: This large moss with a predominant Andean distribution occurs in Guyana at the same elevation as the Neotropical C. subcuspidatus. It is similar in size but it is different in the more slender leaves with flexible subula and in the thin-walled basal laminal cells; the cells just above the auricles are thin-walled, but quickly become incrassate in distal direction.