Part 2, 1913] DICRANACEAE 155 
Type LocaLity: Germany. 
Distrisution: 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. crispata.) 
ILLUSTRATIONS: B.S.G,,Bryol. Eur. pl. 41; G. Roth, Eur. Laubm. pl. 10, f. 16. 
‘ar “Rhabdoweisia crispata (Dicks. ) Kindb. Eur. & N. Am. 
. Bryin. 211. 1897. 
Bryum crispatum Dicks. Pl. Crypt. Brit. 3:3. 1793. 
Weisia crispata Brid. Musc. Recent. 21: 73. 1798. 
Grimmia striata Schrad. Jour. Bot, Schrad. 17992: 55. 1799. Not G. striata Hedw. 1782. 
Weisia denticulate Brid. Musc. Recent. Suppl. 1: 108. 1806. 
Rhabdoweisia denticulate B.S.G. Bryol. Eur. (33-36:) Rhabd. 5. 1846. 
Autoicous: male flowers small, nearly sessile on the stem below the perichaetium, the few 
antheridia without paraphyses and loosely surrounded by few, readily deciduous, ovate to 
oblong-linear, pale, often nearly ecostate leaves with a somewhat acute or bluntish nearly entire 
apex: plants in compact, pale, yellowish-green to brownish tufts, with fragile, branching stems, 
radiculose at the base, mostly less than 1 cm., rarely up to 3 cm. high: stem-leaves below small, 
above 2-3 mm. long, when dry more or less crispate, spreading-flexuous on all sides when 
moist, linear-lanceolate or almost linear from a slightly broader base, keeled above with « 
narrowly or broadly acute apex and flat or nearly flat margins irregularly serrulate to nearly 
entire in the upper part, the leaf-surfaces either smooth or with the cells somewhat mamillose, 
chiefly on the upper side; costa not quite percurrent, nearly or quite smooth on the back, in 
cross-section near the middle showing 4~6 guide-cells, a single row of large cells or sometimes 
a double row and small stereid-band on the upper side, on the under side a broad stereid-band 
with the outer cells differentiated; upper leaf-cells roundish or nearly square to somewhat 
transversely elongate, the median 8 by 10 to 10 by 124, with somewhat thickened walls, 
the lower ones becoming pale and rectangular without differentiated alar cells; perichaetial 
leaves scarcely different from the upper stem-leaves: seta erect, 2-5 mm. long: capsule ovate, 
about 0.7 mm. high, when dry and empty, furrowed and often tapering from the wide mouth 
to the base, with a few stomata in about I row near the base; annulus none; peristome-teeth 
16, reddish, projecting nearly 200 « above the mouth, gradually lanceolate irom a rather broad 
base, somewhat nodose-articulate and from nearly smooth to mostly slightly striate and 
papillose; lid with a subulate beak and 2 or 3 rows of cells at the base usually reddish and not 
much elongate: calyptra cucullate, smooth above, entire at the base: spores roughened, 16- 
18 » in diameter. 
Tyre LOCALITY: England. 
DistrRiIBUTION: Newfoundland to Virginia, end westward to Missouri, Wisconsin, Manitoba, and 
Alaska; also in Europe. ; 
ILLUSTRATIONS: B.S.G. Bryol. Eur. pl. 42; G. Roth, Eur. Laubm. #l. 10, f. 15. 
18. OREOWEISIA De-Not. Atti Univ. Genova 1: 489. 1869. 
Weisia § Oreoweisia B.S.G. Bryol. Eur. (33-36:) Weisia 11. 1846. 
Autoicous, mostly small, compactly tufted rock-mosses. Stems somewhat three-sided, 
with a central strand and more or less radiculose below. Leaves when dry spreading-incurved 
to somewhat crispate, ovate-lanceolate to linear-lanceolate, the apex acute or blunt, with 
borders flat and crenulate or serrulate above, mostly slightly recurved below; costa stout, 
vanishing below the apex, in cross-section near the middle showing often few (2-6) guide-cells 
and a stereid-band mostly on the under side; lower leaf-cells square to rectangular, smooth, 
pale, the alar ones not differentiated, the upper roundish to nearly square, green, mamillose 
or pointed-mamillose on both sides; perichaetial leaves very similar to the upper stem-leaves. 
Seta erect, Capsule erect to somewhat curved and nodding, not furrowed when dry; annulus 
none; peristome-teeth 16, lanceolate, undivided or divided nearly to the base, not papillose, 
somewhat striate to nearly smooth; lid mostly short-beaked. Calyptra cucullate, entire at 
the base. 
Type species, Weisia serrulata Funck. 
