106 NORTH AMERICAN FLORA [VoLtumE 15 
stout, spreading-flexuous point, crispate or spirally twisted when dry; leaf-margins of a single 
thickness of cells, serrulate about one half down and somewhat crenulate nearly to the base; 
costa percurrent or slightly excurrent, somewhat rough on the back near the apex, 80 u wide 
or more a little above the base, in cross-section near the middle showing 5 or 6 guide-cells with 
thin stereid-bands above and below and no differentiated outer cells; alar and basal cells 
similar, very pale to yellowish-brown, mostly rectangular, with thin walls; cells next above 
more elongate, 100 » or more long, with quite uniformly thickened and pitted walls, extending 
about one sixth up the leaf, then mostly becoming much shorter, more irregular with greatly 
thickened walls to the apex of the leaf; median cells about 6 4 wide and 12-20 uw long, the 
marginal sometimes scarcely elongate; perichaetial leaves long-subulate, sometimes nearly 
equaling the seta: seta 2~3 cm. long: capsule (according to Renauld and Cardot) oblong or 
cylindric, smooth; lid unknown; peristome-teeth red, lanceolate-subulate, entire. 
Type Locality: Forests of Barba, Costa Rica, at 2500-2700 meters. 
DistRiBuTion: Known only from the type locality. 
3. Holomitrium calycinum (Sw.) Mitt. Jour. Linn. 
Soc. 12: 60. 1869. 
Bryum calycinum Sw. Prodr. 139. 1788. 
ce bar nie Sw. FL Ind. Occ. 768. 06. 1806 . 
Antheridial flowers not known: plants in rather compact, dusky-green or greenish-brown 
tufts, with branching stems up to 5 cm. high, the older branches often bearing clusters of 
flagella about_1 em. long: stem-leaves crispate when dry, mostly 5-6 mm. long, from a broadly 
ovate, entire base less than 2 mm. long, rather abruptly narrowed to a slender, serrulate, lance- 
olate point usually 2.5-3 times as long, with the margin toward the apex of a double thickness 
of cells; costa excurrent, slightly serrulate on the back near the apex, 70-80 u wide a little 
Sabovetne base, in cross-section near the middle showing about 6 guide-cells with stereid-bands 
above and below and the outer cells differentiated; alar cells forming a distinct, often nearly 
‘square cluster, brownish to nearly hyaline, extending about 200 u up with some much longer 
and narrower cells between them and the costa; cells throughout the broadened lower part 
of the leaf mostly very long and narrow with thickened, pitted walls,in.the point above becom- 
ing much shorter with unevenly thickened scarcely pitted walls; inner perichaetial leaves with 
a convolute base 8-10 mm. high narrowed to a rough point mostly shorter than the base, often 
reaching above the capsule: seta 10-15 mm. long: capsule oblong-cylindric, smooth, brownish, 
up to 3 mm. long; peristome-teeth rather dark-brown, lanceolate, densely papillose, attached 
well below the mouth, either divided along the median line nearly to the base or sometimes 
undivided; lid with a slender beak about two thirds as long as the capsule: calyptra entire 
below, nearly or quite smooth above: spores minutely roughened, 14-16 w in diameter. 
TYPE LOCALITY: Jamaica. 
DISTRIBUTION: Jamaica. 
ILLUSTRATION: Hedw. Sp. Muse. pl. 14. 
/ 
4. Holomitrium marginatum Mitt. Jour. Linn. Soc. 12: 57. 1869. 
Pseudautoicous: male plants minute, usually 1-2 mm. high, in clusters on tomentum of 
the older stems; inner antheridial leaves 0.5-1 mm. long with an ovate, concave base rather 
gradually narrowed to an entire, costate, lanceolate point, enclosing 4 or 5 oblong antheridia. 
scarcely 0.2 mm. long and a few rather longer paraphyses: fertile plants in brownish-green 
tufts with branching stems, tomentose below, up to 5 cm. high; stem-leaves 5-6 mm. long, 
crispate when dry, from a more or less erect and imbricate, broadly ovate or obovate, nearly 
or quite entire base, usually less than 1.5 mm. long and often nearly 1 mm. wide, abruptly 
narrowed to a lanceolate point 2-3 times as long, with the margin of a dowble thickness of cells. 
and serrulate two-thirds down or more; costa percurrent or “slightly excurrent, serrate on the 
back above, about 60 u wide well above the base, in cross-section near the middle showing 
4 or 5 gujde-cells with stereid-bands above and below and outer cells scarcely or not differ- 
entiated; cells of the broadened leaf-base mostly much elongate, with thickened, pitted walls, 
