Par” 2, 1913] DICRANACEAE 79 
enclosing numerous antheridia about 0.5 mm. long with filiform paraphyses: plants in loose, 
thin mats or densely gregarious, with filiform stems, radiculose at the base, mostly 3-5 mm. 
high, bearing solitary branches from just below the flower-buds: stem-leaves minute, appressed- 
convolute, shortly ovate-lanceolate, entire, rather obtusely pointed, 0.6-1 mm. long, the 
upper and perichaetial ones very similar but larger, about 1.5 mm. long, often slightly serrulate 
toward the apex; costa stout, vanishing a little below the apex; leaf-cells all elongate, the 
lower mostly rectangular, gradually becoming somewhat smaller upward and less regular, the 
median cells 8-10» wide and mostly 30-40 4 long, often somewhat hexagonal: seta erect, 
smooth, up to 12 mm. Jong: capsule about 0.6 mm. long, erect, oval, smooth, with thick walls 
apparently without stomata; peristome-teeth reddish-brown, lanceolate, projecting above 
the mouth about 250 u, from entire to divided scarcely one half down, more or less vertically 
striate and papillose on the outer face with articulations distinct; annulus none; lid somewhat 
persistent, conic or shortly beaked, about two thirds the length of the capsule, falling with the 
upper part of the columella: calyptra cucullate, smooth, entire at the base: spores not quite 
smooth, up to 16 » in diameter. 
TYPE LocaLity: Lapland. 
DistRrBvurion: Alaska to British Columbia; Greenland; also in Europe. 
ILLustrations: B.S.G. Bryol. Eur. pl. 94; Rab. Krypt.-Fl. 4: f. 111. 
Exsicc.: Drummond, Musci Am. /00; Macoun, Can. Musci Ila, 25. 
2. Angstroemia jamaicensis C. Miill. Bull. Herb. 
Boiss. 5: 554. 1897. 
Angstroemia brevipes Hampe; Besch. Mém. Soc. Sci. Nat. Cherbourg 16: 163; hyponym. 1872. 
Dioicous: male plants of the same size as the fertile, usually bearing several elongate 
flower-buds, reddish-brown or golden within, the antheridial leaves broadly ovate, abruptly 
narrowed into a smooth hair-point often much longer than the blade and enclosing numerous 
antheridia up to 0.75 mm. long, without paraphyses: fertile plants in mostly glossy, golden- 
green, loose tufts or closely gregarious, with filiform stems, unbranched or with few, mostly 
short branches, up to 6 cm. high: lower stem-leaves very small, closely convolute, short-ovate, 
very shortly pointed, the upper gradually larger and longer-pointed, the uppermost and peri- 
chaetial with the blade wp to 1.5 mm. long and a smooth, subulate point 2-5 mm. long, the 
upper margin of the blade sometimes not quite entire; costa stout, broader above than below, 
excurrent into the point; lower leaf-cells more or less rectangular, 8-10 » wide by 20—40 y» long, 
the upper ones much narrower, somewhat elongate-hexagonal to linear-vermicular, with the 
walls slightly and uniformly thickened, the median cells about 5 » wide by 25-40 p» long: 
seta smooth, erect, 3-5 mm. long: capsule erect, nearly cylindric when dry, up to 2 mm. long, 
smooth, dark-colored when old with 1 or 2 rows of stomata near the base; peristome-teeth 
reddish, rather densely papillose, extending about 300 » above the mouth, 40 » wide at the 
base, more or less split or perforate along the median line; annulus none; lid obliquely 
beaked, less than one half as long as the capsule: spores nearly smooth, up to 16 uw in di- 
ameter. 
‘TYPE LocaLity: Morce’s Gap, Jamaica. 
DISTRIBUTION: Jamaica and Mexico. 
3. Angstroemia vaginata (Hock.) C. Miill. Syn. 2: 608. 1851. 
Dicranum vaginatum Hook. Musci Exot. pl. 141. 1820. 
Angstroemia acerosa Hampe, in Triana & Planch. Ann. Sci. Nat. V. 3: 354. 1865. 
Anisothecium vaginatum Mitt. Jour. Linn. Soc. 12:39. 1869. 
Dioicous: male plants mingled with the fertile, bearing solitary, terminal buds or finally, 
through single branches growing out from just below the perigonium, with several lateral 
buds at regular intervals; perigonial leaves with broad, convolute golden-brown base, rather 
abruptly narrowed to a spreading point with costa nearly percurrent and apex slightly serru- 
late; antheridia numerous, 0.7 mm. long or more, with numerous paraphyses: fertile plants 
somewhat gregarious or in loose tufts, with dull-green, slender stems up to 4 cm. high with 
radicles at the base: lower stem-leaves small with a very short point, the upper larger, 3-4 
mmm. long, with obovate, clasping base abruptly narrowed to a more or less widely spreading, 
