ParT 1, 1909] GLEICHENIACEAE 59 
11. Dicranopteris strictissima (Christ) Underw. Bull. Torrey 
Club 34: 261. 1907. 
Gleichenia strictissima Christ, Bull. Herb. Boiss. IT. 5: 13. 1905. 
Gletchenta glaucina Christ, Bull. Herb. Boiss. II. 6: 283. 1906. 
A small slender plant, rarely more than 50 cm. high; rhizome very slender, about 
1 mm. in diameter, dark-brown, widely creeping, branched, sparingly clothed with slender 
ciliate dark-brown scales; primary leaf-axis 1.5 mm. in diameter, dark-brown and similarly 
paleaceous, glabrescent, continuous, bearing 2 or more pairsof primary branches ; lower pri- 
mary branches about 20 cm. long, usually twice-pseudodichotomous, the primary internode 
about 3.5 cm. long and naked on the lower side, the secondary internode about 5.5 cm. long 
and fully pectinate, the pinnae about 10-13 cm. long, 1.5-2.5 cm. broad, lanceolate, falcate, 
long-acuminate, at the base somewhat attenuate, incised to within 0.5 mm. of the rachis ; 
upper primary branches similar, the uppermost smaller, with the primary internodes usually 
pectinate upon the lower (as well as upon the upper) side nearly to the base; rachis glaucous, 
sparingly and deciduously paleaceous throughout, the scales divergent, lanceolate-subulate, 
ciliate, brownish or yellowish-brown, with reddish tips; segments coriaceous, oblique, 
close, deltoid-lanceolate, conspicuously so in drying, 8-13 mm. long, 3-4 mm. broad at the 
base, subacute, glabrous above, the margins subrevolute (or in drying sometimes strongly 
revolute), the under surfaces decidedly whitish-granulose (the particles subpersistent) and 
very sparingly setulose with scattered minute simple blackish hairs; veins 10-14 pairs, once- 
forked near the base, obscurely elevated ; sori 9-12 pairs, 3-5-sporangiate, inframedial, 
borne upon the anterior branch; receptacle slightly elevated. 
TYPE LOCALITY: Costa Rica. 
DISTRIBUTION: Known only from the interior mountain region of Costa Rica, altitude 1300- 
1600 meters. 
ILLUSTRATION: Bull. Herb. Boiss. II. 6: 287, f. 7. 
12. Dicranopteris costaricensis Underw. Bull. Torrey 
Club 34: 253. 1907. 
Rhizome undescribed ; primary leaf-axis stoutish, rigidly erect, 3-4.5 cm. in diameter, 
continuous, the lower portion brownish-castaneous, glabrous and shining, the upper por- 
tions light-brownish and thickly clothed with deciduous spreading deltoid-lanceolate attenu- 
ate long-ciliate yellowish scales; lateral branches 1 or 2 pairs, spreading, normally three 
times pseudodichotomous (secondary and tertiary axes invariably wanting), the divisions 
widely divaricate; primary internodes 4-9 cm. long, arcuate, 2.5 mm. in diameter, with 
several crowded stipuliform segments at the base, otherwise naked, deciduously paleaceous ; 
secondary internodes widely divergent, 3.5-6.5 cm. long, sometimes naked, more commonly 
pectinate (at least in the lower half), stipulate; tertiary internodes 3-5 cm. long, fully 
pectinate, these and the pinnae densely paleaceous below, the scales similar in form to 
those of the upper primary leaf-axis, but bright-ferruginous, persistent, wide-spreading ; 
pinnae linear, 10-30 cm. long, 1.25-2.7 cm. broad, attenuate, cut to the rachis; segments 
close, thick and rigidly coriaceous, dull dark-green above, subglaucous below, 7-14 mm. 
long, 4-6 mm. broad at the base, oblong to deltoid-oblong, obtuse (often appearing deltoid 
and acute in drying), the margins entire and widely revolute, the costae elevated and 
deciduously paleaceous; veins 8-11 pairs, evident below, mostly once-forked above the 
base, together with leaf-tissue obscurely setulose; sori normally 5-sporangiate, medial or 
slightly supramedial, apart from the costa, seated on the anterior branch. 
TYPE LOCALITY: Volcan de Poas, Costa Rica, altitude 2600 meters. _ ; 
DISTRIBUTION : Apparently confined to the upper slopes and summits of the high peaks of 
Costa Rica (volcanoes of Poas, Turrialba, Barba, and Irazfi), altitude 2400-3000 meters. 
ILLUSTRATION: Bull. Herb. Boiss. II. 6: 287, f. 6 (as Gleichenta revoluta H.B.K.). 
13. Dicranopteris Underwoodiana Maxon, sp. nov. 
A plant of medium size, 50-60 cm. high; rhizome wide-creeping, branched, 2~3 mm. in 
diameter, dark purplish-brown, lustrous, deciduously paleaceous, the scales reddish-brown, 
linear-lanceolate to deltoid-lanceolate, tortuous, rigidly ciliate; primary leaf-axis 2-3 mm. 
in diameter, slightly paleaceous at the base, reddish-brown, glabrate or (above the first 
