Volume 3 > Part 3 > Year 1988 > Page 461 > Athyriaceae > Diplazium

20. Diplazium petri Tardieuwfo-0001116771

Asplen. Tonkin: 67. pl. 9, 1–2. 1932; Tardieu & C.Chr. in Fl. Indo-Chine 7(2): 260. 1940; Tagawa & K.Iwats., S.E. Asian Stud. 5: 104. 1967.

Accepted Name : Diplazium griffithii T.Moore
Index Fil.: 330. 1861.

Description : Rhizome short-creeping; scales dark brown, up to 20 by 1.2 mm, toothed. Stipe about 40 cm long, green to stramineous with dark basal portion. Frond subtriangular, about 45 cm long and wide, bipinnatifid to bipinnate; pinnae stalked, basal pinnae the largest, oblong with acuminate apex, more than 20 cm long, 10 cm wide, with stalks of about 3 cm long, upper pinnae gradually becoming smaller upwards; pinnules narrowing towards acuminate apex, falcate, cordate to decurrent at base, lobed to ⅓ way towards costules, the posterior pinnules usually decurrent to the next ones; chartaceous, deep green; veins pinnate with 2–4 pairs of simple veinlets. Sori usually on basal veinlets, crescentic or diplazioid.

Thailand : SOUTH-EASTERN: Chanthaburi (Khao Soi Dao, Pong Nam Ron); PENINSULAR: Nakhon Si Thammarat (Khao Luang).

Distribution : Indochina (type), Ryukyu, Taiwan.

Ecology : On rather dry mountain slopes in dense evergreen forests at 1,000–1,400 m alt., rather rare.

Notes: This is a species close to Diplazium mettenianum, and intermediate forms were found in Ryukyu and Taiwan, though the Thai materials are distinct in bipinnate fronds and less variable both in size and pinnation.

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