Campylopus angustiretis (Austin) Lesq. & James

J. Florschutz-de Waard, H. R. Zielman & M. A. Bruggeman- Nannenga, 2011, Flora of the Guianas, Series C, fascicle 2., Kew: Kew Publishing : 1-6

1. Campylopus angustiretis (Austin) Lesq. & James , Man. Mosses N. America 80. 1884.

- Dicranum angustirete Austin , Bot. Gaz. 4: 150. 1879.

- Campylopus surinamensis Mull Hal. var. angustiretis (Austin) Frahm , Bryologist 83: 582. 1980. Type: U.S.A., Florida, Jacksonville, Austin s.n. ( NY).

Slender plants growing in dense cushions. Stems to 4 cm high, little tomentose, unbranched, equally foliate. Leaves wide-spreading, slenderly lanceolate, 3-6 mm long, apex keeled; costa 1/3 of leaf width at base, short-excurrent, toothed at apex, in cross-section with small hyalocysts at ventral side and groups of pseudo-stereids at dorsal side; alar cells coloured and inflated in conspicuous auricles, inner basal laminal cells rectangular, thin walled or slightly incrassate, narrower and hyaline towards margin, quickly becoming more incrassate and irregular distally, upper laminal cells regularly oblong, incrassate, to 45 µm long and 8 µm wide along the costa, shorter and rhomboidal along the margin. Sporophyte unknown.

Distribution: Florida, Guyana, French Guiana, SE Brazil (the Guianan collections fill a gap between the Brazilian and the Caribean distribution areas (Frahm 1991 )).

Ecology: Terrestrial on exposed rocks.

Selected specimens Guyana: Kaieteur Falls, along path from guesthouse to Johnson’s View, alt. 420 m, Newton et cd. 3456 ( L, US). French Guiana: Savanne Roche de Virginie, Bassin de l`Approuague, alt. 100 m, Florschütz-de Waard 6150 ( L) _

Note: This species, previously considered as a variety of C. surinamensis (Frahm 1980), was later reinstated as a distinct species (Frahm 1991). It is distinguished from C. surinamensis by the equally foliate stems with wide-spreading leaves; moreover the leaves are more slenderly acuminate with a narrow, keeled apex; the alar cells are more inflated and coloured forming distinct auricles, whereas in C. surinamensis the auricles are often indistinct.