Alsophila imrayana var. basilaris (Christ) Lellinger

Cyathea basilaris Christ, Bull. Herb. Boiss. II. 4: 949. 1904
■ Cyathea reticulata Werckl^ ; Christ, Bull. Herb. Boiss. II. 5 : 251. 1905.
Caudex and stipe undescribed ; rachis stout, unarmed, dull yellowishor reddishbrown, 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, acut« or short-acuminate, the secondary rachis similar to the primary, light reddishor yellowishbrown, rustyfur furaceous below, glabrescent, with a few whitish fibrillose scales intermixed, these with a dark reddish-brown median stripe, above densely covered with appressed 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, subcaudate, 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.