Sticherus strictissimus (Christ) Copel.

Dicranopteris strictissima (Christ) Underw. Bull. Torrey
Club 34: 261. 1907.
Gleichenia siriciissima Christ, Bull. Herb. Boiss. II. 5 : 13. 1905. Gleichenia 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 pairs of primary branches ; lower primary branches about 20 cm. long, usually twice-pseudodichotomous, the primary internode aboutS.S cm. long and naked on the lower side, the secondary internode about5.5 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-gran ulose (the particles subpersistent ) and very sparingly setulo^ewith scattered minute simple blackish hairs ; veins 10-14 pairs, onceforked 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 13001600 meters.