Campylopus dichrostis (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 : 7-8

5. Campylopus dichrostis (Müll. Hal.) Paris in Engler & Prantl, Nat, Pfianzenfam. 1 (3): 333. 1901.

- Dicranum dichroste Müll. Hal. , Hedwigia 39: 255. 1900. Lectotype (Frahm 1991): Brazil, Ule 1359 ( H, BR).

Slender plants growing in dense tufts. Stems to 4 cm high, erect or ascending from a prostrate base, little branched, densely tomentose in lower part. Leaves appressed when dry, erect-spreading when moist, 3-5 mm long, Ovate-lanceolate with acute apex; Costa ca. 1/3 of the leaf base, percurrent or short-excurrent, with serrate ridges at back, in cross-section with a dorsal band of stereids and at ventral side a row of small cells or substereids; laminal cells just above the auricles firm-walled, quadrate to short-rectangular, near the costa 20-50 pm long and 20-25 pm wide, towards margin much smaller, quadrate; upper laminal cells irregular-quadrate or rhomboid. Sporophyte not known.

Distribution Brazil, the Guianas.

Ecology: Terrestrial, on rock and charcoal; in the Guianas not common, confined to white sand savannas and open rock vegetations.

Selected specimens: 1 Guyana: Santa Mission, white sand savanna, Florschütz-de Waard 6110 ( L); Kaieteur Falls, open rock area, alt. 400 m, Newton et al. 3356 ( L, US) Suriname: Granite outcrop, 1 km NW of Voltzberg, Schulz & van Donselaar 10545 ( L). French Guiana: Roche Koutou, Bassin du Haut-Marouini, alt. 480 m, Hoff 5262; idem, de Granville et al. 9425 ( L, CAY).

Note This species is distinguished from C. savannarum by the shorter and broader leaves with the lamina extending to the apex; the costa may be percurrent or short-excurrent, varying along one stem. In this respect the difference with C. savannarum in the modification “bartlettii” distinguished by the same characters, is not sharply marked. Other distinguishing characters could not be observed. Perhaps this species could as well be interpreted as an extreme modification of C. savannarum (Frahm 1991).