ParT 1, 1909] CYATHEACEAE 87 
the forking of the veins, near the costule, close, strongly confluent at maturity; indusium 
rupturing irregularly, wholly evanescent or the inferior portion persistent; receptacle short, 
grayish, depressed-globose or crateriform, setiferous. 
TYPE LOCALITY: Banks of the Rio de Las Vueltas, Tucurrique, Costa Rica, altitude 635 meters. 
DISTRIBUTION : Known only from Costa Rica. 
42. Cyathea basilaris Christ, Bull. Herb. Boiss. II. 4: 949. 1904. 
' Cyathea reticulata Wercklé ; Christ, Bull. Herb. Boiss. II. 5: 251. 1905. 
Caudex and stipe undescribed; rachis stout, unarmed, dull yellowish- or reddish- 
brown, clothed with short detergible squamules and a few pale ovate scales with darker 
centers; pinnae 60-70 cm. long, 20-22 cm. broad, sessile or nearly so, lanceolate, acute or 
short-acuminate, the secondary rachis similar to the primary, light reddish- or yellowish- 
brown, rusty-furfuraceous below, glabrescent, with a few whitish fibrillose scales inter- 
mixed, these with a dark reddish-brown median stripe, above densely covered with ap- 
pressed fulvous hairs; pinnules 30-35 pairs, spreading, subdistant or approximate, strictly 
sessile, linear-lanceolate, about 10-12 cm, long, 1.7-2 cm. broad, long-acuminate, sub- 
caudate, cut nearly to the light-brownish costa, this decidedly furfuraceous below, with 
slender deciduous whitish striped scales intermixed; segments 20-26 pairs, about 9 mm. 
long, 2.5-3 mm. broad, yellowish-glaucous below, dark-green above, somewhat spaced, 
slightly dilatate, connected by a very narrow wing, the margins inflexed, obscurely crenate, 
more deeply so at the subobtuse apex; costules sparsely squamose at the base below, 
glabrescent, above glabrous ; veins dark-brownish, 10-12 pairs, evident, mostly once-forked 
near the base; sori 1-5 pairs, yellowish-brown, borne close to the costule, occupying the 
lower portion of the segment; indusium shallow, rupturing more or less unevenly, the 
base usually persistent as a disciform saccate scale; receptacle somewhat elevated, stout, 
capitate, setiferous, with age grayish and glabrate. 
TYPE LOCALITY: Costa Rica. 
DISTRIBUTION: Mountains of Costa Rica, up to 1800 meters altitude. 
43. Cyathea mexicana Schlecht. & Cham. Linnaea 5: 616. 1830. 
Cyathea hexagona Fée & Schaffn.; Fée, Mém. Foug. 8: 111. 1857. 
Cyathea articulata Fée, Mém. Foug. 8: 111. 1857, 
Cyathea glauca Fourn. "Mex. Pl. Crypt. 135. 1872. Not C. glauca Bory. 
Cyathea arida Christ, Bull. Herb. Boiss. II. 6: 180. 1906. 
Caudex erect, 8-10 meters high, unarmed ; stipe stout, sulcate above, brownish, opaque, 
minutely furfuraceous, toward the base sparingly clothed with slender spinescent-ciliate 
brown scales about 1 cm. long, and armed with slender conical slightly curved shining 
purplish-black spines up to 6 mm. long; primary rachis stout, light-brownish to yellowish- 
castaneous below, lighter in the upper portion, papillose, lightly puberulo-furfuraceous, 
giabrescent ; pinnae dark-green above, pallid and somewhat glaucous below, variable in 
dimensions, up to 85 cm. long and 20 cm. broad, oblong-lanceolate or narrowly so, acu- 
minate, subsessile or petiolate, close or slightly imbricate, deciduous with age, the secondary 
rachis stramineous to light-castaneous, yellowish- or whitish-squamulose below, glabrescent, 
rusty- or brownish-strigose above ; pinnules articulate, readily separable, 30-40 pairs, distant 
to subdistant, narrowly oblong-lanceolate, variable in size, up to 10 cm. long and 1.6 cm. 
broad, usually smaller, sessile or subpetiolate, deeply pinnatifid, the long-acuminate apex 
serrulate to obscurely crenulate-serrate ; costae rusty-strigose above, below (especially toward 
the apex) with a scant covering of whitish or yellowish antrorse hairs, toward the base 
minutely squamulose, the squamules somewhat deciduous, whitish, and with dark-tipped 
processes; segments 18-20 pairs, oblique, oblong to linear-oblong, falcate or subfalcate, 
connected by a wing 1-1.5 mm. broad upon each side of the costa, the margins mostly 
reflexed, obscurely serrulate, more noticeably so at the acute apex, the costules scantily 
furfuraceo-pilose below, glabrous above, except for 1 or 2 stiffish hairs near the apex; veins 
8-12 pairs, simple or once-forked, evident, usually (together with the leaf-tissue below) 
minutely whitish glandular-pubescent ; sori 4-7 pairs, close to the costule, extending two 
thirds or less the distance to the apex ; indusium globose, delicately membranous, pale- 
