Volume 3 > Part 2 > Year 1989 > Page 210–211 > Parkeriaceae > Adiantum

3. Adiantum edgeworthii Hook.wfo-0001115194

Sp. Fil. 2: 14. t. 81. B. 1851; Bedd., Handb. Suppl. Ferns Brit. India: 17. 1892; Ching, Icon. Filic. Sin. 3: t. 139. 1935; Acta Phytotax. Sin. 6: 315. 1957; Tagawa & K.Iwats., S.E. Asian Stud. 5: 109. 1967.— Adiantum caudatum var. edgeworthii (Hook.) Bedd., Handb. Ferns Brit. India: 84. 1883. Fig. 16. 4.

Accepted Name : This is currently accepted.

Description : Rhizome short, erect, scaly at apex; scales narrow, 3–4 mm long, entire, bicoloured with black central portion and dark brow edge. Stipe up to 13 cm long, castaneous to bright blackih-purple, glabrous except scaly lower portion; scales on stipe like those on rhizome but concolorous brown. Lamina linear, simply pinnate, gradually narrowing upwards, up to 20 by 2 cm; rachis perfectly glabrous, usually prolonged, leafless on upper part, rooting at tip; lower pinnae hardly reduced; larger pinnae sessile, half-crescent-shaped to nearly parallelogram-shaped, round to moderately acute at apex, lower margin round, upper margin straight and lobed, inner edge straight, forming narrow cuneate base with lower margin, up to 10 by 5 mm, upper margin lobed to about ⅓ of width of pinnae, forming distinct sinus; lobes round, moderately acute to subtruncate at slightly toothed apex; papyraceous to softly chartaceous, perfectly glabrous on both surfaces; veins rather indistinct. Sori on apices of lobes, reflexed flaps circular or elongate, glabrous.

Thailand : NORTHERN: Chiang Mai (Doi Suthep, Doi Inthanon).

Distribution : NE India (type), Upper Burma, China (north to Manchuria), Tonkin, Taiwan, the Philippines, Timor, and northwards to S Japan.

Ecology : On muddy rocks in semi-shade or evergreen forests at 1,600–1,750 m alt.

Notes: Compared with the preceding two species known in lowlands, this montane species may indicate a northern geographical element. The characteristic feature of this species is the perfectly hairless fronds.

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