Volume 3 > Part 3 > Year 1988 > Page 387–388 > Dryopteridaceae > Pleocnemia

3. Pleocnemia irregularis (C.Presl) Holttumwfo-0001261869

Kew Bull. 29: 347. 1974.— Polypodium irregulare C.Presl, Reliq. Haenk. 1: 21. 1825.— Arcypteris irregularis (C.Presl) Holttum, Reinwardtia 1: 193. f. 1–3. 1951; Rev. Fl. Malaya 2: 538. f. 317–318. 1955; Dansk Bot. Ark. 20: 31. 1961; Tagawa & K.Iwats., S.E. Asian Stud. 3(3): 86. 1965; 5: 101. 1967; Acta Phytotax. Geobot. 23: 56. 1968.

Accepted Name : This is currently accepted.

Description : Rhizome thick, suberect, short, densely scaly; scales linear, up to 30 by 2 mm, dark brown, thin and more or less crisped, entire or irregularly toothed at margin. Stipe up to 80 cm long, dark and scaly at base, stramineous upwards. Lamina bipinnate at base, oblong-subdeltoid, usually more than 1 m long, 70 cm wide at base; basal pinnae the largest, asymmetrically subdeltoid with large basiscopic pinnules, middle pinnae oblong-lanceolate, acute to acuminate at apex, shortly stalked, with several free pinnules, apical portion large, pinnatifid; rachis and pinna-rachis glabrescent; pinnules sessile or more or less adnate, oblong-subdeltoid, falcate, caudate at apex, cuneate at base, waved at margin, usually about 10 by 1.7 cm; chartaceous, green to yellow green, brownish in dried specimens, glandular hairy at margin and on lower surface; veins forming copious anastomoses, a distinct broad tooth at each sinus between pinnules and between crenae of pinnules. Sori small, dorsal on anastomosing veins, scattered irregularly; exindusiate.

Thailand : NORTHERN: Chiang Mai (Doi Chiang Dao), Phitsanulok (Thung Salaeng Luang); CENTRAL: Nakhon Nayok (Salika Falls, Khao Yai); SOUTH-EASTERN: Chon Buri (Ang Chang Nam), Chanthaburi (Khlung, Khao Soi Dao), Trat (Ko Chang); SOUTH-WESTERN: Kanchanaburi (Khao Ngi Yai); PENINSULAR: Chumphon (Khao Tong), Ranong (Thap Li, Lam Liang, Khlong Kam Phuan), Surat Thani (Ban Don), Phuket (Tha Nun), Phangnga (Khlong Nang Yon), Nakhon Si Thammarat (Thung Song, Khao Luang, Ron Phibun), Trang (Khao Chong), Satun, Pattani, Narathiwat (Waeng), Yala (Bannang Sata).

Distribution : Burma (Tenasserim), Cambodia, Malesia throughout (type from the Philippines) to Fiji.

Ecology : On rather dry slopes in dense forests at low or medium altitudes.

E-version notes : For more details see Ferns of Thailand, Laos and Cambodia.