Cheilanthes pseudoargentea (S.K.Wu) K.Iwats.

Family

Pteridaceae, subfamily Cheilanthoideae

Nomenclature

Cheilanthes pseudoargentea (S.K.Wu) K.Iwats., Fl. Thailand 3: 619. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 121. 2000. – Aleuritopteris pseudoargentea S.K.Wu, Mem. Fac. Sci. Kyoto Univ. Biol. 8: 155, f. 2, 3b. 1983.

Cheilanthes farinosa auct. non (Forssk.) Kaulf.: Tagawa & K.Iwats., Fl. Thailand 3: 203. 1985, p.p.

Description

Rhizome short, erect, scaly; scales linear-lanceolate, bi-coloured, dense. Stipes castaneous, about 30 cm long, scaly at lower portion. Laminae pentagonal to ovate-deltoid, about 17 by 15 cm, acuminate at apex, bipinnate-tripinnatifid; lowest pinnae largest, 10 by 6 cm, sessile to subadnate; pinnules 5–8 pairs, lanceolate, acuminate, 5 by 1.5 cm, adnate at base; ultimate segments oblong, 6 by 1.5 mm; firm chartaceous, glabrous, covered with white waxy substances on the lower surface. Sori confluent at maturity; indusia membranous.

Distribution in Thailand

NORTHERN: Chiang Mai.

Wider Distribution

Endemic to Thailand.

Ecology

On calcareous rocks on cliffy mountain ridge near summit, 1900–2100 m alt.

Proposed IUCN Conservation Assessment

Data Deficient (DD). There is considerable taxonomic confusion in the genus Cheilanthes making accurate conservation assessments of many of the species difficult.

Notes

Cheilanthes is a difficult genus that needs more taxonomic research.

Voucher specimens - Thailand

Middleton et al. 4982, Chiang Mai, Doi Chiang Dao Wildlife Sanctuary (E).

Habit

Habit

Rhizome

Rhizome

Stipes with scales

Stipes with scales

Frond

Frond

Basal pinnae

Basal pinnae

Lower surface of lamina

Lower surface of lamina

Sori

Sori

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