Family

Dryopteridaceae

Nomenclature

Arachniodes cavalerii (Christ) Ohwi, J. Jap. Bot. 37: 36. 1962; Tagawa & K.Iwats., Acta Phytotax. Geobot. 24: 63. 1969; Tagawa & K.Iwats., Fl. Thailand 3: 340. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 199. 2000. – Aspidium cavalerii Christ, Bull. Acad. Géogr. Bot. 1904: 116. – Rumohra cavalerii (Christ) Ching, Sinensia 5: 59. 1934; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 328. 1941.

Description

Terrestrial. Rhizome short, ascending, scaly; scales dark brown, small, entire. Stipes stramineous, up to 30 cm or more long, scaly in lower portion. Laminae subdeltoid, about 30 by 20 cm at base, bipinnate to tripinnatifid; rachis like the upper part of stipe, grooved above, glabrescent; basal pinna the largest, distinctly stalked with petioles of up to 2 cm in length, subtriangular with large bipinnatifid basal pinnules and acuminate apex, about 15 by 10 cm; basal basiscopic pinnule like the second basal pinna; larger pinnule of middle pinna or secondary pinnule of larger pinna parallelogram-shaped, subsessile or shortly stalked, acute at apex, cuneate at base, crenate with blunt margin, never aristate-mucronate at apex of lobes; chartaceous, with distinctive odour. Sori large, dorsal on veinlets, usually in one row close to each side of midrib; indusia round-reniform, up to 1.5 mm or more diam., completely covering the sori when young, falling off at maturity, irregular at margin .

Distribution in Thailand

NORTH-EASTERN: Loei.

Wider Distribution

S China, N Vietnam and southern edge of Japan.

Ecology

Terrestrial in evergreen forest at high altitude.

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is fairly widespread and not under any known threats.