Campylopus richardii Bud.

9. Campylopus richardii Bud., Muscol. Recent. Suppl. 4: 73. 1819. Type: Guadeloupe, Parker s.n. (B).

- Campylopus atratus Broth., Trans. Linn. Soc. London, Bot. ser. 2, 6: 89. 1901. Type: Venezuela, Mt. Roraima, MCConnell & (BM). Quelch 527

Plants blackish with light-green tips, growing in dense tufts Stems 6 cm high, usually shorter, tomentose below. Stem leaves appressed, in to fertile plants more or less comose at the end of the Stem, lanceolate, 3 -8 mm long, tubulose at apex with a conspicuous hyaline, serrate hairpoint; Costa filling l/3- 1/2 of the leaf base, in upper pan ridged at back, in Cross-Section with stereids at dorsal and substereids at ventral side; alar cells coloured and inflated, laminal Cells all strongly incrassate and pitted, basal cells rectangular, narrower towards margin, sometimes forming a short hyaline border of 1 -2 cells wide, upper laminal cells oval-oblong or rhomboidal in oblique rows. Sporophyte (description after Frahm 199 I): seta Sinuose or curved, 7-8 mm long, capsule 1.5 mm long, scabrous at base, operculum short-rostrate, peristome teeth narrow, hyaline, filiform, split nearly to base; calyptra ciliate at base.

Neotropics, at higher altitudes (900-3700 m).

Ecology: Terrestrial on rock and exposed gravelly ridges; in the Guianas only known from Mt. Roraima.

Specimens examined: Guyana: N slope of Mt. Roraima, alt. 2000- 2300 m, Gradstein 5358 (L).

Note: This species, reported for Guyana as C. atratus in Musci I in Fl. Suriname 6: 73. 1964, was only known from the Venezuelan side of Mt. Roraima. The hyaline hairpoint, in combination with the rather homogeneous incrassate cell pattern, distinguish this species from other Guianan species with a hairpoint.