Peranema aspidioides (Blume) Mett.

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).

Habit

Habit

Habit

Habit

Crown of rhizome

Crown of rhizome

Stipe bases

Stipe bases

Scales on stipe

Scales on stipe

Unfurling frond

Unfurling frond

Frond

Frond

Upper surface of pinna

Upper surface of pinna

Lower surface of lamina

Lower surface of lamina

Lower surface of lamina

Lower surface of lamina

Sori with indusium disintegrating

Sori with indusium disintegrating

Sori

Sori

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