150 NORTH AMERICAN FLORA [VorumeE 15 
0.6 mm. long, with paraphyses slightly longer: fertile plants in mostly compact, glossy, yellow- 
ish-green tufts, brown within, with slender, more or less radiculose stems up to 8 cm. or more 
high, mostly branching toward the apex, with erect-appressed or slightly spreading, uniformly 
placed leaves: stem-leaves 5—6 mm. long, from an oblong or somewhat linear base rather gradu- 
ally narrowed to a lanceolate, subtubulose point about equaling or a little exceeding the basal 
part in length and denticulate at the apex; costa shortly excurrent, about one half the width 
of the leaf-base, somewhat ribbed on the back, in cross-section showing stereid-bands above and 
below the guide-cells, with the outer cells differentiated on the dorsal side only; alar cells 
often somewhat differentiated, from hyaline to reddish; cells of the lower part of the blade 
rather pale, rectangular, thin-walled, scarcely or not pitted, higher up more irregular, shorter, 
with slightly thickened, more or less pitted walls; inner perichaetial leaves 2-3 times as long 
as the stem-leaves, convolute about three fourths up, gradually narrowed to a denticulate 
point sometimes reaching to the capsule: seta up to 2 cm. long, erect, slightly flexuous, more or 
less roughened above: capsule cylindric, slightly curved, sometimes nodding, smooth when ¢ dry, 
without stomata; annulus wanting; lid conic-rostrate, one third the length of the capsule; 
peristome-teeth 45-60 » wide at the base and about 400 uw high, slender, terete, undivided, 
without a distinct median line, indistinctly articulate except near the somewhat striate base, 
above densely papillose: calyptra reaching well down on the capsule, fimbriate at the base: 
spores nearly smooth, up to 12 uw in diameter. ° 
TYPE LocaLity: Colombia. 
DISTRIBUTION: Mexico; Guatemala; Costa Rica; Jamaica; Guadeloupe; also in South America. 
ILLUSTRATION: Hook. Musci Exot. 1. 5. 
Exsice.: Holz. Musci Acroc. Bor. Am. 309. 
16. DICRANODONTIUM B.S.G. Bryol. Eur. (41:) 
Dicranod. 1. 1847. 
Dicranum § Campylopus C. Mill. Syn. 1: 383, in part. 1848. 
Atractylocarpus Mitt. Jour. Linn. Soc. 12:71. 1869. 
Metzleria Schimp.; Milde, Bryol. Siles. 75. 1869. Not Meizleria Presl, 1839. 
Dicranum § Dicranodontium Kindb. Eur. & N. Am. Bryin. 186. 1897. 
Dioicous or autoicous. Plants in usually compact-tufts with rather slender stems, some- 
times radiculose and bearing rather few branches. Leaves more or less falcate-secund or 
sometimes nearly straight and erect or variously flexuous, rather uniformly and closely placed 
along the stems, often easily detached, ovate-lanceolate, subtubulose, with a rough setaceous 
point, radiculose on the under side of the costa near the base; costa thin, broad, filling most 
of the leaf above, at the base one third as wide as the leaf or wider, slightly ribbed and some- 
times sharply denticulate on the back above, in cross-section near the middle of the leaf show- 
ing stereid-bands above and below the guide-cells with differentiated outer cells on the dorsal 
and usually on the ventral side; alar cells mostly hyaline, sometimes reddish, more or less 
fugacious, often forming distinct auricles; cells of the lower part of the blade short-oblong or 
nearly square to elongate-rectangular, broad toward the costa, narrower and smaller toward 
the margin but scarcely forming a distinct border, with mostly rather thin, more or less pitted 
walls. Seta twisted when dry, erect and straight, often becoming sinuous-erect or bent bow- 
like when moist, or recurved or flexuous either dry or wet. Capsule oblong or cylindric, 
without stomata, the exothecal cells near the mouth in several rows not elongate, below ir- 
regular, elongate, with somewhat thickened, slightly flexuous lateral walls; annulus well de- 
veloped or wanting; peristome-teeth separate to below the mouth of the capsule, divided to 
near the base or about three fourths down, the articulations rather distant, often indinstinct, 
not prominent on the inner face, the outer face more or less vertically or obliquely striate below 
and papillose above or sometimes striate. Calyptra entire at the base (except in D. circinatum 
of Europe and Asia), often reaching to or below the base of the capsule, sometimes not split to 
the base and adhering to the seta. 
Type species, Dicranum denudatum Brid. 
I have not been able to find any constant differences between the various mosses here grouped 
under Dicranodontium, that seem to be of generic value. ‘The general structure of, the costa, the 
shape of the leaf and leaf-cells are very similar in all. The peristome varies chiefly in the width of 
