520 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
side below, more or less papillose on the margin, the ventral leaves very similar 
to the dorsal but much smaller; leaf cells at apex often about 8 « square, half- 
way down the leaf becoming elongate-hexagonal, the basal on one side often 
somewhat transversely elongate, on the other side square to elongate, those 
between often rectangular and up to 25 or 30 w long ; perichaetial leaves small, 
obtuse, scarcely imbricate; capsule exserted on a short pedicel, oblong-cylindrie, 
1 mm. long or less without lid, the latter acutely pointed, its height some- 
times considerably exceeding its basal diameter; exothecal cells more or less 
rectangular, about 20 % wide and up to 40 u long, with thin walls; stomata. 
annulus, and peristome apparently lacking; spores minutely papillose, 25 to 
28 » in diameter. 
Type in the herbarium of the New York Botanical Garden, collected on 
bark with Stereophyllum radiculosum, Bosque de Catuche, near Caracas, Vene- 
zuela, altitude 1,000 meters, January 22, 1922, by H. Pittier (no. 10080a). 
Duplicate in the U. S. National Herbarium. 
This species seems to be most closely related to EHrpodium domingense, but 
the leaves are larger, more rounded, and less densely papillose, and the lower 
leaf cells are mostly not transversely elongate. 
JEXPLANATION OF PLare 38.—Eapodium latifolium R. S. Williams. Fig. a, Part of 
fruiting stem, scale 18; b, dorsal stem-leaf, scale 40; c, ventral stem-leaf, scale 40; d, 
apex of dorsal leaf, scale 200; e, yg, alar cells on opposite sides of dorsal leaf, scale 200 : 
f, intermediate basal! cells of same, scale 200, From the type specimen. 
LACISTEMACEAE. 
Lacistema pittieri Blake, sp. nov. 
Tree 4 meters high; branches slender, strigose; leaves alternate; petioles stri- 
gose, 4 to 6 mm. long; blades oval-oblong or obovate-oval, 10 to 12 em. long, 3 
to 4.8 cm. wide, rather abruptly acuminate (the point acute, 1.5 em. long), at 
base rounded-cuneate, subchartaceous, above deep green, somewhat shining, 
glabrous, beneath duller green, pilose with ascending or spreading hairs along 
the costa and the 6 pairs of lateral veins, glabrous on surface, the secondaries 
straightish, prominulous on both sides; racemes in axillary clusters of 1 to 3, 
sordid-hispidulous, 2 to 2.5 em. long, 3 to 4 mm. thick, rather loosely flowered ; 
bracts 2 subtending each flower, the lower triangular, pubescent, 0.7 mm. long, 
the upper tubular-campanulate, essentially glabrous, deeply bifid, 0.8 mm. long: 
pedicels glabrous, 1.5 mm. long; sepals 4, ovate, 0.9 mm. long, obtuse, obscurely 
Serrulate, glabrous; disk thick, annular; stamen 1, glabrous, the stout subulate 
filament 0.5 mm. long, the connective dilated, the anther cells divergent ; ovary 
densely hispid-pilose, the placentae 3, each bearing 2 ovules; style none; stigmas 
3, about half as tong as the ovary. 
Type in the U. 8. National Herbarium, no, 1,056,630, collected on the U pper 
Guaremales, on ond from Puerto Cabello to San Felipe, Carabobo, Venezuela, 
altitude 450 meters, in forest, July 12, 1920, by H. Pittier (mo. 8974). 
Perhaps nearest Lacistema poeppigit A. DC., but distinguished, according 
to description, by its longer pubescence and by the more numerous veins of 
the leaves. 
SILENACEAE. 
Cerastium cephalanthum Blake, sp. nov. 
Cespitose herbaceous perennial, densely short-pilose throughout with several- 
celled “subglandular hairs, only slightly viscid; sterile basal branches several, 
about 4 cm. long, very densely leafy ; stems simple or subsimple, erect, 17 to 30 
em. high, bearing 3 to 6 pairs of leaves above the base, the internodes 2 to 9 em. 
