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FOC | Family List | FOC Vol. 2-3 | Pteridaceae | Aleuritopteris

26. Aleuritopteris leptolepis (Fraser-Jenkins) Fraser-Jenkins, Taxon. Revis. Indian Subcontinental Pteridophytes. 127. 2008.

薄叶粉背蕨 bao ye fen bei jue

Cheilanthes leptolepis Fraser-Jenkins, Bot. Helv. 102: 144. 1992; Aleuritopteris dalhousiae (Hooker) Ching, nom. utique rej.; C. dalhousiae Hooker, nom. utique rej.; C. farinosa (Forsskål) Kaulfuss var. dalhousiae (Hooker) C. B. Clarke, nom. utique rej.; Leptolepidium dalhousiae (Hooker) K. H. Shing & S. K. Wu, nom. utique rej.; L. leptolepis (Fraser-Jenkins) Kholia & Punetha.

Rhizomes erect, short; scales bicolorous, black with narrow brown margins, ovate to broadly lanceolate. Fronds clustered. Stipe dark brown, lustrous, shorter than lamina, 10-15 cm, scaly at base or nearly to midpoint; basalmost scales bicolorous, dark brown to black with lighter margins, grading to concolorous, light brown, thin and translucent, ovate to broadly lanceolate. Lamina ovate-triangular, 15-22 × 8-12 cm, pinnate-bipinnatifid, thinly herbaceous when dry, usually farinose during development but becoming non-farinose or nearly so at maturity, glabrous except for inconspicuous hairs at pinna bases abaxially, glabrous adaxially; pinnae 10-12 pairs, basal pair of pinnae triangular-lanceolate, 6-10 × 4-6 cm, bipinnatifid; pinnules 8-10 pairs, basal basiscopic segments longer than adjacent acroscopic ones, to 3 cm, lanceolate, pinnatifid; second and upper pairs of pinnae of same shape as basal one, but slightly shorter and narrower. Veins pinnate, relatively conspicuous. Sori consisting of several sporangia, confluent at maturity. False indusia interrupted, membranous, with laciniate margins. 2n = 60.

Rock crevices in forests; 1900-3500 m. SW Sichuan, SE Xizang, NW Yunnan [Bhutan, India, Kashmir, Myanmar, Nepal, Pakistan, Philippines].

Aleuritopteris leptolepis was long known to Asian botanists as A. dalhousiae, but the basionym Cheilanthes dalhousiae was typified by a mixed collection and was thus of ambiguous application; the name has been formally rejected preventing further use.


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