Parr 2, 1913] DICRANACEAE 11 
and paraphyses slightly longer: fertile plants in extensive green mats, more or less whitish 
from the hyaline leaf-borders, with often branching stems 1-4 cm. high: stem-leaves about 
6 mm. long, falcate-secund, lanceolate-subulate, subtubulose, the point variously flexuous, 
denticulate at the apex and sometimes minutely serrulate on the margins, rather densely 
papillose on the back one half down the leaf or more, less papillose on the inner face; costa 
excurrent, pale, about 30 » wide below and one ninth the width of the lower part of the leaf; 
hyaline border of the leaf extending from near the apex to the base, very narrow above, widest 
about three fourths down (12 cells wide), then narrowing to the base; upper leaf-cells green, 
from roundish to oblong, 4 » by 4-6 yu, gradually becoming longer below, about 6 u by 20-40 » 
and smooth, with somewhat thickened not pitted or very slightly pitted walls, the alar ones 
oblong, brown, not or scarcely auriculate; perichaetial leaves about as long as the stem-leaves, 
the outer with a very broad base abruptly narrowed to the slender point, the inner with a 
, longer clasping base less abruptly narrowed above: seta red, up to 18 mm. long: capsule erect, 
cylindric, nearly straight, about 2.5 mm. long, with a conic, slender-beaked lid one half as long; 
annulus none; peristome-teeth reddish to the apex, nearly smooth or slightly papillose above 
and indistinctly striate below, divided one half to three fourths down, the articulations below 
on the outer face prominent, 8-12 » apart: calyptra slightly rough one third down, split one 
half up or more on one side, the base entire or slightly notched: spores slightly roughened, up 
to 16» in diameter. 
TYPE LOCALITY: Cuba. 
DisTRIBUTION: Cuba; Jamaica; Dominica; Guadeloupe; Martinique. 
Exsice.: Sull. Musci Cub. Wright. 35; Husnot, Pl. Ant. 120 (as L. Bridelii Hampe, ms.); 
Holz. Musci Acroc. Bor. Am. 308. 
3. Leucoloma Criigerianum (C. Miill.) Jaeger, Ber. St. Gall. Nat. 
Ges. 1870-71: 412. 1872. 
Dicranum Criigerianum C. Mill. Syn, 2: 588. 1851. 
Poecilophyllum Criigerianum Mitt. Jour. Linn. Soc. 12: 92. 1869. 
Dicranum asperrimum C. Mill. Linnaea 42: 472, 1878. 
Leucoloma asperrimum Paris, Index Bryol. 758. 1896. 
Dioicous: fertile plants in low, soft tufts; stems fragile, with few branches and spreading- 
flexuous leaves: stem-leaves lanceolate-subulate, 4-5 mm. long, more or less subtubulose, the 
slender point grooved, entire except at the slightly denticulate apex, rather densely papillose 
on the back, to below the middle of the leaf; costa percurrent or slightly excurrent, mostly 
one twelfth or less the width of the lower part of the leaf; border of narrow elongate cells, in 
one row above, gradually widening downward and merging into the lower leaf-cells; cells in 
the upper part of the blade mostly short, about 6 « wide and from not elongate to 3 times as 
long as wide, gradually longer below, rather irregular, those toward the base with unequally 
thickened, slightly pitted walls, the alar ones brownish, forming a distinct group, scarcely or 
not auriculate, of large, often nearly square cells; perichaetial leaves from a broad, convolute 
base abruptly narrowed to a setaceous point: seta red, erect: capsule narrowly cylindric and 
symmetric; peristome-teeth red, divided to the middle into 2 subulate-lanceolate forks, trabec- 
ulate below. 
TYPE LOCALITY: Trinidad. . =, 
DisTRIBUTION: Vera Cruz (Jalapa, alt. 1500 m.); Jamaica; also in Trinidad and Venezuela. 
4. Leucoloma subimmarginatum (C. Miill.) Jaeger, Ber. St. Gall. 
Nat. Ges. 1870-71: 412. 1872. 
Dicranum subimmarginatum C. Mill. Syn. 2: 589. 1851. 
Poecilophyllum subimmarginatum Mitt. Jour. Linn. Soc. 12: 94. 1869: 
Very similar to L. Crigertianum, but smaller: leaves lanceolate-subulate, 2.5-3 mm. long, 
with margins incurved above and entire except at the sharply denticulate, rather stout apex; 
costa percurrent, at base about 25 » wide and one twelfth the width of the lower part of the 
leaf; leaf-cells in the margin smooth, narrow and elongate, forming a distinct, not hyaline 
border one cell wide in the upper part of the leaf, becoming gradually wider below and merging 
into the lower leaf-cells; cells of the blade above mostly not elongate, up to 8 » wide, more or 
less covered on the back with rather prominent, often compound or lobed papillae, extending 
