Parr 1, 1909] GLEICHENIACEAE 57 
6. Dicranopteris orthoclada (Christ) Underw. Bull. Torrey 
Club 34: 259. 1907. 
Gleichenia intermedia dissitifolia Baker, Jour. Bot. 25: 24. 1887. 
Gleichenia orthoclada Christ, Bull. Herb. Boiss. 11.5: 16. 1905; doc. cit. 6: 282. 1906. 
Rhizome short-creeping, closely branched, sparsely clothed with dark setaceous scales ; 
primary leaf-axes subfasciculate, slender, entirely glabrous (like the whole plant), shining, 
castaneous, 15-25 cm. long, continuous; primary lateral branches 3-5 pairs, 5-8 cm. apart, 
simple or mostly once-pseudodichotomous, provided with foliaceous stipules at the base, 
pectinate throughout (including the internode, if present), 10-20 cm. long, 4-7 em. broad, 
acuminate, narrowed at the base, the rachis yellowish, somewhat flexuous ; pinnules bright- 
green above, somewhat glaucous below, rigidly herbaceous, about 20-25 pairs, distant, 
4-8 mm. apart, mostly at right angles (the lower ones somewhat reflexed), adnate, sur- 
current, obtuse (or acute in drying), 2-3.5 cm. long, 3-4 mm. broad, the margins entire 
and often closely revolute, the costae yellowish, elevated ; veins 20-25 pairs, oblique, dark, 
evident upon both surfaces, forked near the base, the branches divergent; sori mostly 
3-5-sporangiate, casually 2- or 6-sporangiate, medial or supramedial, seated upon the 
anterior branch, apart from the costa; receptacle slight, elevated. 
TYPE LOCALITY: Costa Rica. 
DisTRIBUTION: Known only from the interior mountain region of Costa Rica, at mid- 
elevations. 
7. Dicranopteris trachyrhizoma (Christ) Maxon. 
Gleichenia trachyrhizoma Christ, Bull. Herb. Boiss. II. 6: 280. 1906. 
Rhizome rather slender, finely tuberculate, densely clothed with rigid linear-lanceo- 
late blackish-brown opaque divergent spinescent-ciliate scales; primary leaf-axis elongate, 
rigid, subflexuous, at the base dark and somewhat tuberculate, above slender, together 
with the axes of the lateral branches sparsely and very minutely yellowish-furfuraceous 
and bearing a few thick deltoid acuminate spinescent-ciliate dark-brown scales, these sub- 
persistent at the sides; primary branches 2 pairs, about 10 cm. apart, the upper pair sim- 
ple, sessile and fully pecinate upon both sides to the base ; lower pair once-pseudodichoto- 
mous (or sometimes simple), the internode 8-20 cm. long, fully pectinate upon both sides, 
both nodes provided with small deeply parted stipular segments 5-8 mm. long, the divi- 
sions of these slender and siliquiform in drying, the terminal bud small, abortive, clothed 
with small opaque deltoid-lanceolate dark reddish-brown spinescent-ciliate scales; pinnae 
greatly elongate, up to 40 cm. long, 5-7 cm. broad, acuminate, slightly or not narrowed at the 
base, fully pectinate, the rachis light- or yellowish-brown, shining, sulcate above; segments 
‘very numerous, subcoriaceous, fragile, spreading at right angles, separated by a broad sinus 
at the slightly dilatate base, linear, 2.5-3.5 cm. long, 1.5-2.5 mm. broad, dull-green, slightly 
glaucous below, the margins entire, unequally revolute, the costa very prominent, bearing 
a few minute roundish deeply fimbriate yellowish scales, glabrescent; veins 20-40 pairs, 
dark, close, oblique, once-forked at an acute angle above the base ; sori mostly 3- or 4-spo- 
rangiate, medial, the receptacle yellowish and punctiform. 
TYPE LOCALITY : Valley of the Rio Navarro, Costa Rica, altitude 1400 meters. 
DISTRIBUTION : Costa Rica. 
8. Dicranopteris intermedia (Baker) Underw. Bull. Torrey 
Club 34: 258. 1907. 
Gleichenia intermedia Baker, Jour. Bot. 25: 24. 1887. : 
Gleichenia axialis Christ, Buli. Herb. Boiss. II. 5: 14. 1905; doc. cit. 6: 283. 1906. 
Rhizome undescribed; primary leaf-axis elongate, rigidly erect, stout, 3-5 mm. in 
diameter, yellowish to reddish-brown, sulcate (or above compressed, the edges sharply 
carinate), wholly glabrous (like the entire plant), continuous ; primary lateral branches 
3-5 pairs, 4-6 cm. apart, ascending, often strict and crowded, 14-20 cm. long, mostly once- 
pseudodichotomous in the lower fourth (the internode 2-4 cm. long), cut to the rachis, fully 
pectinate throughout, provided with large deeply and irregularly incised foliaceous stipules 
