Rhabdoweisia fugax Bruch & W. P. Schimper ex B. S. G. 1846

Rhabdoweisia fugax (Hedw.) B.S.G. Byrol. Eur. (33-36:)
Rhabd. 4. 1846.
Weisia fugax Hedw. Sp. Muse. 64. 1801.
Weisia vulcanica C. Mull. Syn. 1: 649. 1849.
Weisia Lindigiana Hampe, in Triana & Planch. Ann. Sci. Nat. V. 3: 352. 1865.
Rhabdoweisia vulcanica Mitt. Jour. Linn. Soc. 12: 55. 1869.
Autoicous: male flower mostly on a short stalk just below the perichaetium, the antheridia, without paraphyses, about 0.16 mm. long, loosely enclosed by the perigonial leaves, the inner perigonial leaves ovate, acutely pointed, ecostate, often not quite entire on the margin, the
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outer ones longer pointed, costate: plants in compact tufts 1-3 cm. high, with branching, fragile stems, radiculose at the base: lower stem-leaves very small, the upper ones 2-3 mm. long, more or less crispate when dry, spreading-flexuous when moist, nearly linear to linearlanceolate, narrowly and acutely pointed, keeled above, entire or nearly entire and flat on the margins, the leaf-surfaces mostly smooth, sometimes, chiefly on the upper side, mamillose; costa not quite percurrent, smooth on the back, in cross-section near the middle showing 4-7 guide-cells, 1 or 2 rows of large cells on the upper side with rarely a small stereid-band, on the under side a large stereid-band and outer cells differentiated; upper leaf-cells from roundish to nearly square or transversely elongate with somewhat thickened walls becoming paler and mostly rectangular near the base, without differentiated alar cells; perichaetial leaves much like the stem-leaves: seta erect, 2-4 mm. long: capsule ovate, 0.75 mm. high, when dry and empty furrowed and often tapering from the wide mouth to the wedge-shaped base, with a few stomata in the base; annulus none; peristome-teeth 16, reddish, mostly smooth, projecting about 140 yu above the mouth, filiform to near the base, the abruptly broadened base usually scarcely projecting above the rim; lid obliquely subulate-beaked, with usually 2 or 3 rows of somewhat transversely elongate cells at the base: calyptra cucullate, smooth above, entire at the base: spores roughened, up to 16 n in diameter. Type locality: Germany.
Distribution : Mexico; also in South America and Europe. (All the specimens from north of Mexico that have been referred to R, fugax evidently belong to R. crisp ata.)