Sticherus underwoodianus (Maxon) Nakai

Dicranopteris underwoodiana Maxon, sp. nov
A plant of medium size, 50-60 cm. high ; rhizome wide-creeping, branched, 2-3 mm. in diameter, dark purplish-brown, lustrous, deciduously paleaceous, the scales reddish -brown, linear-lanceolate to deltoid-lanceolate, tortuous, rigidly ciliate ; primary leaf-axis 2-3 mm. in diameter, slightly paleaceous at the base, reddish-brown, glabrate or (above the first pair of branches) clothed with subpersistent narrow pale-rusty laxly spreading long-ciliate scales, these extending to the main vascular parts of the branches ; primary lateral branches
2 pairs, about 14 cm. apart, twice pseudodichotomous, spreading, the primary internode 3-6.5 cm. long, slender, nearly naked, bearing one or several segments upon the upper side near the base and casually 1 or 2 at the base below ; secondary internodes 3.5-10 cm. long, fully pectinate upon both sides, the included bud often conspicuous, rounded-oblong in outline, densely clothed with long-ciliate rusty scales ; pinnae linear, slightly narrowed at the base, especially upon the inner side, 18-30 cm. long, 2.5-3.2 cm. broad, gradually attenuate, the rachises closely invested with short rusty chaff ; segments 50-80 pairs, delicately herbaceous, dull dark-green above, paler and minutely granulose below, linear-oblong from a slightly broader base, scarcely joined, flattish, acutish or sharply apiculatein drying, the margins narrowly revolute, the costa relatively slight, clothed with deeply cleft rusty scales, the divisions slender ; veins 12-15 pairs, dark-reddish and slightly elevated below, once-forked near the base, fibrillose with rusty stellate hair-like scales ; sori mostly 4-sporangiate, casually 3or 5-sporangiate, medial or slightly supramedial , seated upon the anterior branch, the receptacle relatively large.
Type collected at the border of forests, temperate regions of Chiapas, Mexico, 1864-1870, Ghiesbreght 271 (herb. D. C. Baton).
Distribution: Southern Mexico and the high mountains of Quich^, Guatemala.

Sticherus underwoodianus là một loài dương xỉ trong họ Gleicheniaceae. Loài này được Maxon Nakai mô tả khoa học đầu tiên năm 1950.