58 NORTH AMERICAN FLORA [VotumE 16 
at the base; segments coriaceous, 1-2.5 cm. long, linear-oblong or linear-deltoid and acute 
in drying, contiguous at the base, there 3.5-4.5 mm. broad, the margins entire and strongly 
revolute, the costa yellowish, elevated ; veins 15-20 pairs, evident (especially above), mostly 
once forked near the base, the lower ones rarely 2-3-forked ; sori about 15 pairs, 3-6-spo- 
rangiate, normally 5-sporangiate, nearly medial, borne upon the anterior branch; receptacle 
small, slightly elevated. 
TYPE LOCALITY: Costa Rica. 
DISTRIBUTION : Known only from the interior mountains of Costa Rica. 
9. Dicranopteris farinosa (Kaulf.) Underw. Bull. Torrey 
Club 34: 254. 1907. 
Mertensia farinosa Kaulf. Wes. Farrenkr. 37. 1827. 
Mertensia subirisperma Fée, Mém. Foug.11: 122.. 1866. 
Gleichenia farinosa Hook. Sp. Fil. 1:9, in part. 1844. 
Gleichenia subtrisperma Krug, Bot. Jahrb. 24: 78. 1897. 
A small erect plant, 15-35 cm. high; rhizome 2-3 mm. in diameter, dark- or purplish- 
brown, shining, freely branched, tuberculate from the detachment of roots, deciduously 
paleaceous, the scales bright-castaneous, linear-lanceolate, ciliate; primary leaf-axis brown- 
ish, sparingly clothed with narrow yellowish-brown ciliate scales, glabrescent, bearing 2 or 
3 pairs of mostly once-pseudodichotomous branches (the uppermost sometimes simple), the 
axis of the lowermost sometimes continued beyond the fork and bearing a second pair of 
simple pinnae; primary internodes 1-1.5 cm. long, pectinate upon the upper side, naked 
on the lower ; pinnae 7-14 cm. long, 2-3.5 cm. broad, oblong-lanceolate, acuminate, incised 
nearly to the rachis; segments very coriaceous, slightly oblique, very close, linear-oblong, 
1-1.8 cm. long, about 2.5 mm. broad, acute, glabrous above, below decidedly granulose, 
the particles subclavate, yellowish-white, persistent; rachises rather thickly clothed below 
with spreading linear-lanceolate deeply ciliate yellowish scales, the costae with a few dull- 
yellowish filiform scales; veins 20-25 pairs, once-forked near the costule, concealed, the 
overlying tissue elevated, the granular particles here elongate-clavate; sori 3- or 4-sporangiate, 
nearly medial, borne upon the anterior branch. 
TYPE LOCALITY: Not known. 
DISTRIBUTION: Guadeloupe and Martinique; not uncommon at altitudes of from 900 to 1450 
meters. Ascribed also to Trinidad, probably with incorrectness. 
ILLUSTRATIONS: Kunze, Anal. Pterid. £/.3,; Fée, loc. cit. pl. 32, f. 2. 
10. Dicranopteris bicolor (Christ) Underw. Bull. Torrey 
Club 34: 252. 1907. 
Gleichenia bicolor Christ, Bull. Herb. Boiss. II. 6: 279. 1906. 
Rhizome flexuous, densely clothed with shining atropurpureous lanceolate-subulate 
scales 5 mm. long; primary leaf-axis continuous, stout, 6 mm. or more in diameter, elon- 
gate, the lower portion clothed with spreading rigid scariose ovate-subulate dark-brown 
white-margined scales up to 5 mm. long and with other yellowish-white scales, the upper 
parts with-a dense covering of spreading broadly ovate-acuminate shining silvery-white 
scales, these often purplish at the base; primary branches several pairs, very ample, 2 or 3 
times pseudodichotomous, the primary internode 5-11 cm. long, naked, densely paleaceous, 
the bud from this usually not prolonged as a secondary axis; secondary internodes 5-8 cm. 
long, usually naked; tertiary internodes 6-13 cm. long, fully pectinate like the pinnae; 
pinnae up to 33 cm. long, 7-10 cm. broad, narrowly oblong to lanceolate, incised nearly to 
the rachis, glabrous; segments very coriaceous, usually somewhat revolute in drying, linear, 
acute, wholly glabrous, very glaucous below, 3.5-5 cm. long, 3-3.5 mm. broad, dilatate at 
the base (5 mm. broad), joined by a wing 1-1.5 mm. broad on each side of the rachis; 
veins 25-50 pairs, dark, inmmersed, oblique, once-forked near the base; sori numerous, 
normally 5-sporangiate (casually 3- or 4-sporangiate), slightly inframedial, borne upon the 
anterior branch. 
TYPE LOCALITY: Valley of the Rio Navarro, Costa Rica, altitude 1400 meters. 
DISTRIBUTION : Interior mountains of Costa Rica; reported also from Tovar, Venezuela. 
[ILLUsTRATION: The text figure by Christ, Bull. Herb. Boiss. II. 6: 287, f 9, is incorrect ; the 
primary internodes of the lateral branches are naked, the secondary usually so.] 
