MAXON—STUDIES OF TROPICAL AMERICAN FERNS, 165 
of these cleft or divided nearly to the base into 2 slender ultimate segments, these thus 
nearly free or acutely joined in pairs, linear or slightly clavate, 1.5 to 4 mm. long, 
mostly 0.5 mm. or less broad; veins solitary in each division, or, if 2, each extending 
to a separate marginal lobe; sori solitary, each completely terminating a division or 
lobe, the indusium transversely oblong or oval, more delicate than the opposed leaf 
portion, whitish, partially free at each side. Leaf tissue rigidly herbaceous, the veins 
slightly elevated. 
Type in the U.S. National Herbarium, no. 372179, collected in an open bushy 
ravine near Pinar del Rio, province of Pinar del Rio, Cuba, February 22, 1900, by 
William Palmer and J. H. Riley (no. 42). 
This form has been referred sometimes to O. fumarioides, with which species it has 
no near relationship whatever. In its armature it is not unlike true O. aculeata, as 
here defined, and notwithstanding its remarkably fine-cut foliage it is in other respects 
clearly allied to that species. It is one of the smallest members of the genus, 
The following material is in the U. 8. National Herbarium: 
Cusa: Without locality, Wright 898, 1804. Herradura, Van Hermann 760; Baker 
2074; Britton & Earle 6589. Near El Guama, in small ravine of exposed 
mountain slope, Palmer & Riley 214. Consolacion del Sur, Palmer & Riley 
469. Sierra de Cobra, on Guane Road, bank of stream, Britton, Britton & 
Gager 7187. (All but the first in the province Pinar del Rio.) 
Iste oF Pines: Near Nueva Gerona, flat ground among bushes, July 3, 1900, 
Palmer & Riley 984. Same locality, on exposed stream bank, July 7, 1900, 
Palmer & Riley 1022. Same locality, Curtiss:362. Without locality, A. A. 
Taylor 5. 
EXPLANATION OF PLATE 3.—Portion of the type specimen of Odontosoria wrightiana, showing the primary 
axis and one of a pair of opposite primary pinne. Natural size. 
6. Odontosoria colombiana Maxon, sp. nov. 
Lamina not very ample, about 60 to 70 cm. broad, quadripinnate, the primary 
rachis castaneous, 2 to 2.6 mm. in diameter, subterete (only the upper face flattish, 
with a relatively heavy marginal ridge at each side), slightly muricate from the 
presence of a few minute scattering conical spines upon all sides, these about 0.5 mm. 
long; primary pinne opposite, 30 to 40 cm. long, 10 to 20 cm. broad, oblong to narrowly 
ovate, the secondary rachis strongly flexuous, bearing a few narrowly conical hooked 
retrorse spines, 1 mm. long, or less; secondary pinne (larger ones) about 10 or 12 pairs, 
alternate, strongly retrorse, approximate or distant, ovate to deltoid-oblong, 5 to 10 
cm. long, 2.5 to 5 cm. broad, the tertiary rachises strongly flexuous, sparingly aculeo- 
late below; pinnules of the third order ovate to deltoid-oblong, the larger ones (6 to9 
pairs) 1 to 2.5 cm. long, 0.5 to 1.3 em. broad, alternate, retrorse-spreading, their 
rachises greenish-marginate, slender (0.3 to0.4 mm. broad), flexuous; pinnules of the 
fourth order alternate, 3 to7 pairs, variable in outline, the larger (basal and middle) 
ones consisting of 2 or 3 alternate stalked divisions, these usually once dichotomous, 
the segments divaricate, linear, 1.5 to 3 mm. long, 0.2 to0.5 mm. broad, not broader 
than the slender similarly foliaceous stalks except at the slightly clavate apices; 
sori solitary, each terminating a segment, the indusium broadly triangular, nearly 
as broad as the scarcely modified opposed terminal portion of the segment, partially 
free at each side. Leaf tissue dark green, delicately herbaceous. 
Type in the U. S. National Herbarium, no. 826368, collected near Amalfi, province 
of Antioquia, Colombia, altitude about 2,000 meters, September, 1884, by F. C. 
Lehmann (no. XXXIV). 
In the shape and size of the ultimate segments the resemblance of this species to 
O. schlechtendahlii is so great that a specimen of the above collection (Lehmann XXXIV) 
was so determined by Hieronymus.! But O. schlechtendahlii is entirely unarmed in 
1 Bot. Jahrb. Engler 34: 454. 1905. 
