154 NORTH AMERICAN FLORA [VoLuME 15 
subulate beak a little shorter than the capsule: calyptra reaching to near the base of the capsule: 
spores nearly smooth, about 13 » in diameter. 
TYPE Locality: Cerro San Andres, Michoacan. 
DISTRIBUTION: Mexico. 
17. RHABDOWEISIA B.S.G. Bryol. Eur. (33-36:) 
Rhabd. 1. 1846. 
Autoicous, the male flowers mostly on short stalks just below the perichaetium. Smalt 
mosses, mostly about 1 cm., rarely up to 3 em. high, growing in compact cushions, often on 
sandstone; stems somewhat five-angled, without a central strand, bearing short, readily 
separating branches and radicles at the base. Leaves lanceolate to linear, more or less acutely 
pointed, mostly crispate when dry, spreading-flexuous on all sides when moist, smooth on 
both surfaces or often mamillose, chiefly on the upper surface, never papillose; leaf-borders 
flat or somewhat recurved on one side below and entire or serrulate at the apex; costa stout, 
ending just below the apex, in cross-section showing 4-7 guide-cells and a strong stereid-band 
on the under side which is quite absent or very small on the upper side; cells of the blade 
distinct, mostly roundish or somewhat square to transversely elongate above, toward the base 
becoming rectangular and paler, without differentiated alar cells; perichaetial leaves resembling 
the upper stem-leaves. Seta erect, 2-5 mm. long. Capsule erect, regular, less than 1 mm. in 
height, when dry and empty deeply 8-furrowed, with few stomata at the base; annulus none; 
peristome-teeth 16, from a low, basal membrane, narrowly lanceolate, the point often filiform, 
the median line wanting and the surface from smooth to faintly striate or papillose; lid with a 
long, obliquely subulate beak. Calyptra cucullate, smooth above, entire at the base. 
Type species, Weisia fugax Hedw. 
Stem-leaves all narrowly lanceolate-pointed; peristome-teeth very narrow, mostly 
filiform from near the base. 1. R. fugax. 
Stem-leaves, at least in part, more or less broadly and abruptly pointed; peristome- 
teeth lanceolate. 2. R. crispata. 
1. Rhabdoweisia fugax (Hedw.) B.S.G. Byrol. Eur. (33-36:) 
Rhabd. 4. 1846. 
Weisia fugax Hedw. Sp. Musc. 64. 1801. 
Weisia vulcanica C. Mill. 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 
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 linear- 
lanceolate, 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 » 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 u in diameter. 
