Macromitrium standleyi E. B. Bartram 1928

Macromitrium standleyi E. Bartr. Contr
U. S. Nat. Herb. 26: 85. 1928.
Primary stems creeping, 15 cm. long or longer, slender, not radiculose, their leaves appressed, or secund at the ends; secondary stems not crowded, mostly unbranched, about 2 cm. long, tawny, rather densely foliate; leaves flexuous-spreading when dry and often somewhat secund, up to 18 mm. long, narrowly linear-lanceolate, very gradually narrowed to a long, filiform acumination, the margins undulate-crisped in the upper %, ciliate-dentate in the upper half, denticulate nearly to the base; costa red, excurrent into a long, denticulate hair-point; leaf -cells elongate, the upper and median about 40 x long, the lumen scarcely as wide as the incrassate, pitted longitudinal walls, longer and narrower toward the margins and gradually elongate to the very long, narrow, yellowish, tuberculate basal cells; perichaetial leaves shorter, the hair-point up to half their length, their upper cells much longer and narrower; autoicous; seta about 2 cm. long, red, smooth; capsules globose-pyriform, about 1.75 X 1.5 mm., abruptly contracted to a short, sulcate neck; calyptra smooth; peristome evidently double (but the capsules examined old and operculum and spores lacking).
Type locality: Cerro de las Caricias, Province of Heredia, Costa Rica, alt. 2000-2400 (Standley fr Valerio 52147; type in herb. Bartram examined).
Distribution: Known only from the type locality.

Macromitrium standleyi là một loài Rêu trong họ Orthotrichaceae. Loài này được E.B. Bartram mô tả khoa học đầu tiên năm 1928.