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

Family

Pteridaceae, subfamily Cheilanthoideae

Nomenclature

Cheilanthes siamensis (S.K.Wu) K.Iwats., Fl. Thailand 3: 617. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 121. 2000. – Aleuritopteris siamensis S.K.Wu, Mem. Fac. Sci. Kyoto Univ. Biol. 8: 152, f. 1, 3a. 1983.

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

Description

Rhizome short, suberect, scaly; scales narrowly lanceolate, brownish, pubescent or glabrous. Stipes castaneous, polished, 20–50 cm long, glabrous with scaly base. Laminae oblong-lanceolate to deltoid-oblong, acuminate at apex, 12–40 by 9–25 cm, bipinnate-tripinnatifid; lateral pinnae 5–13 pairs, largest ones 5.4–18 by 2.6–7 cm, oblong-lanceolate, long acuminate at apex, with stalks 10–15 mm in length; ultimate segments oblong-lanceolate, about 4 mm broad, acute, wavy at margin; chartaceous, creamy farinose on lower surface of lamina. Sori terminal on veinlets, protected by reflexed marginal flaps.

Distribution in Thailand

NORTHERN: Nan, Lampang.

Wider Distribution

Endemic to Thailand.

Ecology

On limestone cliffs at 350–500 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

La-Ongsri & Norsaengsri 1733, 1746 & 1885, Nan (QBG).

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