Dennstaedtia scabra (Wall. ex Hook.) T.Moore

Family

Dennstaedtiaceae

Nomenclature

Dennstaedtia scabra (Wall. ex Hook.) T.Moore, Index Fil.: 307. 1861; Bedd., Handb. Ferns Brit. India: 24, f. 12. 1883; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 91, f. 11.3 & 11.4. 1939; Ching, Fl. Reipubl. Popularis Sin. 2: 204, pl. 16, f. 1 & 2. 1959; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 49. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 111, f. 6.11–6.14. 1979; Boonkerd & Pollawatn, Pterid. Thailand: 86. 2000. – Dicksonia scabra Wall. ex Hook., Sp. Fil. 1: 80, t. 28B. 1844.

Description

Rhizome long creeping, hairy, about 4 mm diam.; hairs pale brown, articulated, 2–4 mm long. Stipes shining castaneous, hairy throughout, grooved on the upper surface of upper parts, the base dark, up to 40 cm long; lamina oblong-subdeltoid, acuminate at apex, quadripinnate, 30–40 cm long, up to 25 cm wide; rachis orange to brown, grooved on upper surface, hairy or a little prickly; lateral pinnae largest at base, gradually reducing in size upwards; the basal pair of pinnae subtriangular with large basal acroscopic pinnule, the next few broadly lanceolate, long-tailed at apex, unequally cuneate at stalked base; larger pinnules oblong, acuminate at apex, cuneate and stalked at base, up to 6 cm long, 2.5 cm wide; costae and costules grooved but interrupted, hairy throughout; ultimate segments oblong, oblique, round to subacute at apex, unequally cuneate at sessile base, up to 1.5 cm long, 8 mm wide, lobed to 2/3 way towards costules; lobes rotundate, oblique or spathulate, obscurely undulate at margin; papyraceous or softer, yellow green to green, hairy, on under surface of main veins and on upper surface of veins and veinlets. Sori marginal; indusia cup-shaped.

Distribution in Thailand

NORTHERN: Chiang Mai.

Distribution in Laos

Hua Phan, Xieng Khouang.

Wider Distribution

India to Burma and China, Indochina, Taiwan, Philippines, Borneo (var. tenuisecta) and Sulawesi, north to Japan.

Ecology

At summit of Doi Inthanon in Sphagnum-bog.

Proposed IUCN Conservation Assessment

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

Notes

This is a common species from Himalayas to Japan, and is a representative of the warm temperate element in Thailand.

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