Sticherus pteridellus (Christ) Copel.

Dicranopteris pteridella (Christ) Underw. Bull. Torrey
Club 34: 260. 1907.
Gleichenia pteridella Christ, Bull. Herb. Boiss. II. 6: 284. 1906.
Rhizome undescribed; primary leaf -axis elongate, rigidly ascending, terete, subflexuous, yellowish or dull greenish-brown, glabrate, 2.5-3.5 mm. in diameter, 50 cm. or more long, continuous above, bearing 2 or 3 pairs of spreading primary lateral branches about 12-16 cm. apart; lower primary branches with a continuous (secondary) slender naked axis bearing 2 (or rarely 1] pairs of lateral branches, the first internode 2-3 cm. long, with simple stalked pinnae or once-forked branches at the node above, the second internode elongate (up to 11 cm. long), with small mostly twice-forked lateral branches at the node above, these with mostly short naked internodes and stalked pinnae ; tertiary lateral axes normally abortive, the buds (as in the minor dichotomies) sharply ovate in outline, the scales dark reddish-brown, oblong-ovate, acute, with whitish ciliate margins; upper primary branches usually once-pseudodichotomous, the internode 2.5-4 cm. long, naked, the pinnae stalked (or very rarely the segments descending to the upper part of the internode), 15-22 cm. long, 3.5-4.5 cm. broad, lanceolate, acuminate, pectinate, slightly or not narrowed at the base, the rachis (like the internodes) nearly glabrous or with a few small scattered appressed scales like those of the buds ; segments rigidly herbaceous, close, spreading or slightly decurved, linear from a slightly dilatate base, 1.5-2.4 cm. long, about 3 mm. broad, acutish, dull yellowish-green, much paler below, the margins entire and lightly revolute, the costa prominent below, yellowish, glabrate ; veins about 25-32 pairs, subimmersed below, slightly elevated and conspicuous above, once-forked near the base ; sori inframedial, seated upon the anterior branch, 4-6-sporangiate ; leaf-tissue whitishgranulose below, bearing also minute scattered whitish simple or mostly substellate glandlike scales, these sometimes dark-centered.
Type LOCALITY : Costa Rica.
Distribution : Interior mountain region of Costa Rica, up to 1450 meters elevation.

Sticherus pteridellus là một loài dương xỉ trong họ Gleicheniaceae. Loài này được Christ Copel. mô tả khoa học đầu tiên năm 1947.