382 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
4. Hemitelia contigua (Underw.) Maxon, sp. nov. PLATE 18, 
Cnemidaria contigua Underw. MS. 
“‘Caudex ascending, then erect, 80 cm. long;” fronds 1.4 meters long, few; stipe 
slender, 20 cm. long, brown, very narrowly but deeply sulcate at either side of the 
upper surface, scantily and minutely puberulous, and bearing scattered brown ovate- 
lanceolate scales, the rachis similar and with a shallow dorsal groove; lamina about 
120 cm. long, oblong-lanceolate from a rather abruptly narrowed base (5 cm. broad), 30 
to 38 cm. broad near the middle, the apex acuminate; pinnz opposite, about 37 pairs, 
subsessile (the short stout stalks 1 to 2 mm. long, often narrowly alate, especially at 
the upper side), the lowermost pair oblong, 2 to 2.5 cm. long, the next. pair 6 cm. dis- 
tant, 5 cm. long, linear-oblong, deeply crenate, those above rather abruptly larger, 
closer, and crenately lobed; middle pinne approximate or contiguous, 15 to 19 cm. 
long, 2.5 to 3.2 cm. broad, linear-oblong from an obliquely truncate slightly inequilat- 
eral base, pinnately cut about halfway to the costa, the apex gradually tapering, long- 
acuminate, the coste elevated on both surfaces, broader below and bearing a few large 
membranous bright brown scales at the sides; lobes about 20 to 24 pairs, deltoid-oblong, 
7 to 8 mm. broad at the broadly triangular sinuses, 7 to 10 mm. long, slightly falcate 
toward the rounded apex, entire or nearly so, the costules evident, bearing an occa- 
sional thin scale below; veins 9 or 10 pairs, free, prominent below, simple, or those of 
the proximal sides sometimes once-forked, the branches each soriferous; sori large, the 
uppermost ones near the costule, those below medial, the lower ones distinctly supra- 
medial, the series thus broadly A-shaped, the sori of the lobe proper equidistant from 
the margin; indusia pale brown; leaf tissue membranous, paler and decidedly lustrous 
below. 
Type in the Underwood Fern Herbarium, New York Botanical Garden, collected in 
wet forest in mountains 5 miles south of Cartago, Costa Rica, altitude about 1,800 
meters, May 12, 1906, by William R. Maxon (no. 523). This specimen consists of two 
sheets, comprising the lamina complete and a portion of the stipe. 
Related to H. chiricana, from which it departs widely in its simpler venation, shorter 
and triangular-oblong lobes, darker scales, and especially in its greatly reduced lower 
pinne. The species is known only from the type collection. 
EXPLANATION OF PLATE 18,—Middle pinnz of type specimen, Mazon 523. Natural size. 
5. Hemitelia pittieri Maxon, sp. nov. Puate 19, a. 
Caudex and stipe unknown; lamina apparently 1.5 meters long or more, 60 to 70 
em. broad, abruptly acuminate; rachis stoutish, stramineous, distantly muricate, 
canaliculate ventrally, closely and deciduously yellowish-furfuraceous and bearing an 
occasional dark-centered ovate scale with wide whitish erose-fimbriate margins; pinns 
ample, nearly alternate, inserted about 7 cm. apart on each side, oblong-linear, 30 to 
35 cm. long, 4 to 5.5 cm. broad, spreading, sessile, not narrowed at the base, obliquely 
truncate at the upper side, rounded or subcordate at the lower, in the lower and middle 
part pinnatifid two-thirds the distance to the costa, the costal wing thus 8 to 10 mm, 
broad from sinus to costa, gradually broader toward the apex, the pinna there pinnati- 
fid more than halfway to the costa except at the relatively short and deeply serrate 
acuminate apex; cost elevated, lightly canaliculate and glabrous above, glabrescent 
below; segments about 21 to 25 pairs, oblong, 10 to 12 mm. broad at the sinuses, falcate, 
close, parallel, the sinuses acute, linear, 1 to 2 (or rarely 3) mm. broad, the margins sub- 
revolute, subentire or at the rounded apex obscurely crenate-dentate, the costules ele- 
vated, slender, strongly arcuate toward the apex, yellowish and glabrous above, glab- 
rate below; veins almost invariably free, slender, elevated, 10 to 14 pairs, mostly once- 
. forked near the base, the branches divergent, mostly soriferous near their middle ; sori 
large, approximate, extending in an unbroken medial line from near the apex down- 
ward to a point on the costal wing much nearer to the costa than to the sinus, there meet- 
ing the sori of the adjoining segment and forming one end of a nearly perfect ellipse; 
indusium ample, membranous, semicircular in outline, commonly bilobed, the lobes 
