162 NORTH AMERICAN FLORA [Voroume 15 
above and 3 below, and near the base, 2 layers above and 2 below, with the leaf-blade one half 
way between the costa and margin often of a double thickness of cells; cells of the hyaline 
leaf-blade mostly rectangular, often nearly square, with thin, pitted walls, the upper margin 
of the blade slightly crenulate; perichaetial leaves scarcely differentiated: seta erect, at least 
10 mm. long: capsule about 2 mm. long, erect, ovate-oblong, with 3-5 rows of transversely 
elongate cells about the mouth, and stomata near the base, often rather obscure; peristome- 
teeth 16, in pairs, linear-lanceolate, nearly smooth, without a median line, the articulations 
prominent; lid subulately beaked, at least two thirds the length of the capsule: calyptra 
extending nearly one half way down the capsule, with an entire base and mooth apex: spores 
rough, about 16 uw in diameter. 
TYPE LOCALITY: Surinam. 
DistrisutTion: Cuba, Jamaica, Porto Rico, Guadeloupe, and St. Vincent; also in northern South 
America. eae 
4. Octoblepharum erectifolium Mitten, sp. nov. 
Flowers and fruit unknown: plants in pale-green or brownish-white tufts, with stems 
mostly less than 2 cm. high: stem-leaves crowded, fragile, mostly broken in the older plants, 
slightly curved to almost straight and erect, up to 2 cm. long or more, from a small, oblong 
base about 1.5 mm. long, more or less abruptly narrowed to a long-ligulate point with a rounded 
or broadly acute, slightly apiculate and serrulate or entire apex, in cross-section near the middle 
showing about 4 layers of cells above and 3 layers below the triangular chlorocysts, near the 
base 2 layers above and 2 below the often quadrate chlorocysts; hyaline lamina of the leaf- 
blade of one thickness of cells with walls thin and more or less pitted, the marginal cells of 
the blade elongate-rhomboidal, within larger and longer, 20-30 » wide by 100 w long or more, 
the leaf-margin above somewhat crenate-serrate. 
Type collected in Trinidad, Cruger (herb. Mitten, in herb. N. Y.§Bot. Gard.). 
DISTRIBUTION: Jamaica; also in Trinidad. 
DOUBTFUL SPECIES 
= Octoblepharum Mitteni Jaeger (O. longifolium Mitt.) of the Amazon region has been credited 
to Guadeloupe, apparently through mistaken determination. See Besch. Ann. Sci. Nat. VI. 
3: 191. 1876. 
3. LEUCOBRYUM Hampe, Flora 20: 282. 1837. 
Pseudautoicous. Male plants minute, mostly 2-3 mm., rarely up to 6 mm. high, growing 
in clusters on dense tufts of tomentum either enclosed by archegonial leaves of sterile flowers 
below fruit-bearing branches or sometimes scattered along the inner surface of the tubulose 
point of stem-leaves; antheridia few, 2-4, with few paraphyses. Fertile plants in greenish- 
white often very compact cushions with branching stems from 2 cm. up to 20 cm. high. 
Leaves more or less crowded, with an appressed-imbricate base and a spreading, straight or 
flexuious, subtubulose, sometimes falcate-secund point, mostly minutely denticulate at the 
apex; leaf consisting mostly of a broad nerve 2-8 layers of hyaline cells in thickness, enclosing 
a single row of small, green cells (chlorocysts) more or less quadrangular in cross-section, the 
blade forming a hyaline border in the lower part of the leaf, 5~10 rows of narrow, elongate 
cells in width, gradually narrowing and disappearing in the upper part of the leaf, the inner 
cell-walls of both costa and blade usually very porose; radicles often growing from the apex of 
the stem-leaves, and frequently numerous linear or linear-lanceolate deciduous leaves much 
smaller than the ordinary leaves occurring in great numbers on abundantly fruiting as well as 
on sterile plants. Fruit dicranoid, very similar in the different species. Capsule without 
stomata; annulus mostly lacking; peristome-teeth strongly articulate, vertically striate, 
with slender papillose points. Calyptra cucullate. 
Type species, Dicranum|ylaucum edw.', 
' 
This genus has usually been described as dipicous and so figured by both Schimper and Braith- 
wait, who illustrate male plants of L. glaucum several centimeters high, with large flowers containing 
12-14 antheridia. I have néver seen such plants from either Europe or North America; a specimen 
of L. glaucum in the herbdrium of the New York Botanical Garden (Musci Eur. Stirp. Norm.) 
marked ‘“e manu Schimper 1860 co” has only sterile archegonial flowers. 
