Arachniodes speciosa (D.Don) Ching

Family

Dryopteridaceae

Nomenclature

Arachniodes speciosa (D.Don) Ching, Acta Bot. Sin. 10:259. 1962; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 93. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 343, f. 30.5–6. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 200. 2000. – Aspidium speciosum D.Don, Prodr. Fl. Nepal.: 51. 1825. – Rumohra speciosa (D.Don) Ching, Sinensia 5: 53, pl. 7. 1934; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 325. 1941.

Arachniodes coniifolia (T.Moore) Ching, Acta Bot. Sin. 10: 257. 1962; Boonkerd et al., Thai For. Bull. (Bot.) 32: 8. 2004; Boonkerd & Pollwatn, Nat. Hist. J. Chulalongkorn Univ. 6: 22. 2006. – Lastrea coniifolia T.Moore, Index Filicum 88 (1857).

Description

Terrestrial. Rhizome short, erect or ascending; scales dense, linear, up to 2 cm or more long, 1.5 mm broad at base, brown, entire, more or less crisped in linear apical portion. Stipes stramineous, densely scaly at base, more sparsely upwards, up to 1 m long; scales on upper part smaller and narrower, dark. Laminae oblong-subdeltoid, more than 80 by 50 cm, tripinnate; rachis scaly, grooved; pinnae gradually reducing in size upwards, the lowest the largest, middle pinnae falcate, oblong-subtriangular, gradually narrowing towards acuminate apex, distinctly stalked, up to 30 by 12 cm at base; pinna-rachis densely fibrillose scaly; pinnules oblong-subdeltoid, caudate-acuminate at apex, unequally cuneate at distinctly stalked base, 5–7 by 1.5–2 cm; segments oblong-lanceolate to subquadrangular, oblique or slightly falcate, acute to acuminate, crenate at margin, about 1.2 by 0.4 cm; chartaceous, deep green, fibrillose scaly, glabrous on laminar surfaces. Sori terminal on veinlets, closer to midrib than to margin of segments, round; indusia round reniform glabrous .

Distribution in Thailand

NORTHERN: Chiang Mai, Phitsanulok; SOUTH-WESTERN: Kanchanaburi.

Wider Distribution

Himalaya to SW China and Vietnam.

Ecology

On rather dry mountain slopes in mixed or in evergreen forests at medium altitudes.

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is widespread and not under any known threats.

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