Family

Dryopteridaceae

Nomenclature

Peranema aspidioides (Blume) Mett., Fil. Lechl. 2. 33. 1859. – Diacalpe aspidioides Blume, Enum. Pl. Javae.: 241. 1828; Bedd., Handb. Ferns Brit. India: 18, :f. 7. 1883; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 292, f. 31.1 & 31.2. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 481, f. 284. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 23: 237. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 92. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 330, f. 28.3–28.7. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 202. 2000. – Cyathea aspidioides (Blume) Moritz, Syst. Verz.: 108. 1854.

Description

Rhizome short, ascending, covered with scales; scales linear-subtriangular, up to 10 by 2 mm, entire, glabrous, brown. Stipes dark stramineous to brown, deep brown on abaxial surface, polished, up to 40 cm long, scaly throughout. Laminae oblong-subdeltoid, about as long as stipe, tripinnate to quadripinnate; rachis minutely scaly throughout; pinnae more than 10 pairs, basal ones the largest, up to 20 by 12 cm, asymmetrically subtriangular, middle ones falcate, oblong-subtriangular, caudately acute at apex, broadly cuneate at base, about 15 by 7 cm; pinnules oblong-subdeltoid, acute at apex, unequally broadly caudate at subsessile base, 2–4 by 0.8–1.2 cm, posterior side of basal pinnae more than 10 cm in length; segments oblong to spathulate, oblique, sessile, subentire or pinnate in larger ones, rounded at apex, narrowly cuneate at base, about 7 by 3 mm in those of middle pinnae; pinnae papyraceous, green to deep green, sparsely hairy on veins, hairs articulated. Sori dorsal on veinlets, round; indusia glabrous , green when young, turning dark brown to black with age, about 0.7 mm diam.

Distribution in Thailand

NORTHERN: Mae Hong Son, Chiang Mai; NORTH-EASTERN: Loei; SOUTH-WESTERN: Prachuap Khiri Khan; CENTRAL: Nakhon Nayok; SOUTH-EASTERN: Chanthaburi; PENINSULAR: Chumphon, Ranong, Krabi, Nakhon Si Thammarat.

Distribution in Laos

Champasak.

Wider Distribution

Sri Lanka, N India, S China, Indochina and throughout Malesia.

Ecology

On humus-rich floor of dense forests at medium or high altitudes.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 4895, Chiang Mai, Doi Inthanon National Park (E); Middleton et al. 4938, Chiang Mai, Doi Pha Ti Do (E); Middleton et al. 5143, Loei, Phu Luang Wildlife Sanctuary (E).