Sticherus bifidus (Willd.) Ching

Dicranopteris bifida (Wilid.) Maxon
Mertensia bifida Willd. Sv. Vet.-Akad. Handl. II. 25: 168. 1804. Gleichenia bifida Spreng. Syst. Veg. 4 : 27. 1827. Mertensia fulva Desv. M6m. Soc. lyinn. Paris 6; 200. 1827. Gleichenia brevipubis Christ, Bull. Herb. Boiss. II. 6 : 280. 1906. Dicranopteris cubensis Underw. Bull. Torrey Club 34 : 253. 1907. Dicranopteris fulva Underw. Bull. Torrey Club 34: 255. 1907.
A suberector ascending diffuse plant, forming extensive thickets; rhizome wide-creeping, 3-4 mm. in diameter, light or dark reddish-brown, sparingly clothed with slender short-ciliate antrorse scales and more or less tuberculate from the persistent bases of roots ; primary leaf -axis at first erect, eventually declining, elongate, light greenish-brown, or at the base darker and deciduously chaffy like the rhizome, above covered at first with pallid rusty ciliate scales, these extending to the main vascular parts of the lateral branches, imperfectly deciduous ; primary lateral branches 2 or several pairs, onceor twice-pseudodichotomous, a secondary axis very rarely developed ; primary internode of the larger lateral branches 2.5-7 cm. long, wholly naked or usually imperfectly pectinate upon the upper side and naked below, the segments commonly much reduced, mostly appearing as short triangular lobes, the lower side almost invariably naked; secondary internodes 3.511 cm. long, sometimes naked on both sides, more commonly pectinate throughout upon both sides, the several pairs of basal segments frequently much reduced (especially upon the inner side) or rarely altogether wanting upon the outer side of the internode; pinnae linear to linear-lanceolate, variable, 30-55 cm. long, 3-7 cm. broad, usually somewhat arcuate, attenuate, fully pectinate or rarely naked for a distance of 1-2 cm. at the outer base, the included bud clothed with pale rusty or rarely somewhat castaneous scales, the rachises stramineous to light-castaneous, lustrous, chaffy, the scales rusty, spreading, imperfectly deciduous ; segments mostly linear from a dilatate base, once or twice their width apart from an obtuse sinus, slightly connected, straight or subfalcate, acutish or obtuse, covered below with rusty tomentum, this Usually quite obscuring the venation or with age whitish and densely matted, sometimes disappearing ; margins entire, closely revolute ; veins numerous, 18-35 pairs, once-forked at the base, the branches apart, elevated below, scarcely evident above; sori 3or 4(rarely 5-) sporangiate, inframedial, borne upon the anterior branch, appearing imbedded in the tomentose covering of the segments.
Type locality : Near Caracas, Venezuela.
Distribution : Comlnon and generally distributed throughout the "West Indies ; from Mexico

Sispa raki-raki, sispa raki raki, rata-rata icha rata rata (Gleichenia bifida) nisqaqa Piruwpi kawsaq hampi yuram, raki-rakim.

Sticherus bifidus là một loài dương xỉ trong họ Gleicheniaceae. Loài này được Willd. Ching mô tả khoa học đầu tiên năm 1940.