178 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
to linear-lanceolate), less conspicuously costate, and of a much firmer texture. It is 
not likely to be mistaken for L. linjfoliwm under any circumstances. Superficially 
only it somewhat resembles lax forms of L. tazifolium, though it is readily distin- 
guished by its slender stems, and by its more distant, nonimbricate, and less rigid, 
6-ranked leaves. The relationship with L. tazifolium is not close. 
' Lycopodium tubulosum Maxon, sp. nov. Puate 10. 
Plants epiphytic, pendent, 20 cm. long, 4 to 6 times dichotomous (the ultimate 
branches numerous and loosely fasciculate), continuously sporangiate in the apical 
third. Stems slender (0.6 to 0.8 mm. in diameter), partially obscured by the rather 
dense covering of leaves near the base, less so above, coarsely subflexuous; leaves dull 
yellowish green, rather rigidly membrano-herbaceous, strongly ascending, obscurely 
6-ranked, mostly twisted near the base (the tortion often continued nearly throughout), 
the leaves thus somewhat dorsiventrally arranged, linear-lanceolate to subligulate, 
10 to 13 mm. long, 1.2 to 1.4 mm. broad, narrowly acute, slightly narrowed at the base, 
falcate, entire, flattish or the inner surface more or less concave in drying; costee per- 
current, medial, evident as a slender dorsal ridge, stronger toward the base; sterile 
leaves of the upper branches gradually smaller, 5 to 7 mm. long, narrower, linear- 
acicular, concave or inwardly subtubulose, especially near their base; sporophyls 3 to 
5 mm. long, strictly ascending, incurved, lance-acicular in outline, the bases about 1 
mm. broad, carinate, strongly concave within and almost completely sheathing the 
sporangia, the sporophyls above this rather abruptly narrowed, tubulose except at the 
flattish acute tips; sporangia orbicular-reniform, about 1 mm. broad. 
Type in the U. 8. National Herbarium, no. 861142, collected at Pacayas, at the foot 
of the Volcano Turrialba, Costa Rica, altitude 1,400 meters, December, 1908, by 
P. Biolley, jr. (no. 17398). 
Lycopodium tubulosum is related to L. taxifolium Swartz, but departs widely from 
that in all essential characters. It is very much more slender and is smaller in all its 
parts, with very numerous, loosely fasciculate, lax, fertile branches, very much smaller, 
narrower and differently shaped leaves, and sporangia half the size of those of L. taxi- 
folium. It shows an alliance to that species chiefly in its tortuous leaves and tubulose 
sporophyls. The last feature, however, is not an invariable character of L. taxifolium 
and is to be observed only in certain very large and fully mature individuals which 
are uncommonly fertile and have the sporophyls much reduced and very different in 
shape from the sterile leaves. Other (mostly younger) specimens of L. taxifolium 
have the sporophyls of precisely the same size and shape as the sterile leaves. The 
sporophyls of L. tubuloswm are strongly incurved (which is not true for any form of L. 
taxifolium), and their tubulose condition is not affected by water. 
Agreeing closely with the type are the following additional specimens, both in 
the U. S. National Herbarium: 
Costa Rica: From tree trunks along the Agua Caliente, Finca Navarro, alt. 1,350 
meters, May 21 to 23, 1906, Mazon 695. La Palma (on the Atlantic slope), 
alt. about 1,520 meters, July 22, 1888, Pittier 272. 
EXPLANATION OF PLATE 10.—Apical portion of one of the type specimens of Lycopodium tubulosum. 
Natural size. 
A NEW CYATHEA FROM SANTO DOMINGO. 
There have recently been described by Brause ! five new species of 
Cyathea from the West Indies, as follows: Cyathea tenuis from Cuba, 
and Cyathea urbani, CO. hieronymi, C. domingensis, and C. irregularis 
from Santo Domingo. These, which appear to be valid, with the 
1In Urban, Symb. Antill. 7: 151-155. 1911. 
