164 NORTH AMERICAN FLORA (VorumE 15 
about 0.5 mm. long, enclosing 2 or 3 antheridia and few paraphyses: fertile plants in robust, 
loose mats, with branching stems up to 15 cm. high, bearing crowded leaves, spreading-flexuous 
or somewhat squarrose in the upper part, from an appressed base: stem-leaves 14-22 mm. long, 
from an ovate or ovate-lanceolate base gradually narrowed to a long tubulose often twisted 
point slightly denticulate at the acute apex; costa in cross-section near the base showing mostly 
“tor often 6 ayers Of Cells, except near the middle, where there are usually 2 layers above and 
one layer below the chlorocysts; leaf-blade mostly 7 or 8 cells wide below; inner perichaetial 
leaves 5-6 mm. long, narrowed to a point scarcely as long as the oblong base: seta red, up to 
3.5 mm. long, solitary, appearing more or less aggregate from the crowding ol the perichaetial 
buds on short branches, finally becoming lateral: capsule nodding, about 2 mm. long, strongly 
contracted, curved and ribbed when dry; peristome-teeth reddish-brown, closely articulate 
and vertically striate below, divided more than one half down into 2 filiform, papillose forks; 
lid conic, with a slender beak about as long as the capsule: spores nearly smooth, about 16 » 
in diameter. 
TyPH LOCALITY: Colombia. 
DistRiBuTIoNn: Cuba; Jamaica; Barbados; Costa Rica; also in northern South America. 
Exsicc.: Sull. Musci Cub. Wright. 44; Holz. Musci Acroc. Bor. Am. 307. 
3. Leucobryum albicans (Schwaegr.) Lindb. Oefv. Sv. Vet.-Akad. 
Foérh. 20: 402. 1863. 
Dicranum albicans Schwaegr. Suppl. 2?: 122. 1827. 
Leucobryum longifolium Hampe; C. Mill. Linnaea 17: 317. 1843. 
Pseudautoicous: male plants as in L. giganteum: fertile plants large, approaching the 
smaller forms of L. giganieum in size, with branching stems up to 4 cm. or more high and bearing 
spreading-flexuous, often somewhat secund, crowded leaves: stem-leaves 8-14 mm. long, from 
an ovate base, gradually tapering to a tubulose point 2-4 times as long with the apex denticulate 
to entire; costa inl cross-section near the base showing I layer of cells above and 1 below the - 
chlorocysts along the middle, with mostly a few rows of cells in a double layer above and below, 
usually nearer the margin than the middle of the costa; leaf-blade 6-9 cells wide below; 
perichaetial leaves shorter than the upper stem-leaves, the inner ones with a convolute base 
about one half their length: seta 15—25 mm. long: capsule nodding, often distinctly strumose, 
much contracted, curved and ribbed when dry, scarcely 2 mm. long; annulus finely developed, _. 
of 2 or 3 rows of cells; peristome-teeth divided one half down or more, about 120 » wide at the 
base; lid with a slender beak about as long as the capsule: spores slightly rough, 12-14 » in 
diameter. 
Typ LocaLity: Near Rio de Janeiro, Brazil. 
DistRrButTION: Cuba; also in South America. 
ILLUSTRATION: Schwaegr. Suppl. pl. 186. 
This is, so far as known, the only species of Leucobryum having an annulus. 
4, Leucobryum albidum (Brid.) Lindb. Oefv. Sv. Vet.-Akad. 
Forh. 20: 403. 1863: 
Dicranum albidum Brid. Musc. Recent. 2': 167. 1798. 
Dicranum glaucum pumilum Michx. Fl. Bor. Am. 2: 297. 1803. 
Dicranum glaucum albidum Brid. Bryol. Univ. 1: 409. 1826. 
Leucocobryum vulgare minus Hampe, Linnaea 13: 42. 1839. 
Leucobryum sediforme C. Mill. Syn. 1:75. 1848. 
Leucobryum minus Hampe; Sull. in A. Gray, Man. ed. 2. 624. 1856. 
Leucobryum pumilum E. G. Britton, Bull. Torrey Club 19: 190. 1892: 
Leucobryum incurvifolium C. Mill. Bull. Herb. Boiss. 5: 174. 1897._— 
Leucobryum glaucum albidum Card. Rev. Bryol. 38: 80. 1911. 
Pseudautoicous: male plants 1-3 mm. high, on tomentum enclosed by old perichaetial 
leaves of sterile archegonia; flowers with 2 or 3 antheridia about 0.25 mm. high, without 
paraphyses, surrounded by 4 or 5 lanceolate-pointed leaves from a somewhat broader, concave 
base: fertile plants in compact cushions, with branching stems up to 3 cm. high, bearing 
crowded leaves erect-appressed or widely spreading at the tips: stem-leaves 2-4.5 mm. long, 
from an ovate base narrowed to a subtubulose point usually scarcely as long as or often much 
shorter than the base; costa in cross-section near the base showing 2 layers of cells above and 
