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

47. Pteris decrescens Christ, Bull. Acad. Int. Géogr. Bot. 16: 244. 1906.

多羽凤尾蕨 duo yu feng wei jue

Plants 60-70 cm tall. Rhizome erect, short, 1-2 cm in diam., apex with black-brown scales. Fronds clustered (8-12 per plant); stipe dark straw-colored, slightly lustrous, 15-20 cm × ca. 2 mm, ± rough, with sparse gray bristles when young, bristles deciduous; rachis similar to stipe; lamina 2-pinnatipartite, oblong or broadly lanceolate in outline, 30-50 × 12-15 cm, attenuate toward base and apex; lateral pinnae 10-15 pairs, opposite, ca. 5 cm apart at base, oblique, slightly shortly stalked, upper sessile; terminal pinna lanceolate, 7-10 × 2-2.5 cm, wider at base, shortly stalked, base broadly cuneate, upward attenuate, apex narrowly linear-caudate, 1.5-4 cm; segments 15-20 pairs, alternate or subopposite, subspreading, 1-2 mm apart, linear, 5-12 × ca. 2.5 mm, slightly expanded at base, margins entire and with cartilaginous edge, apex obtuse and with 2-7(-12) small teeth; costae abaxially convex, straw-colored, with sparse multicellular gray bristles, adaxially deeply grooved, with narrow ridges on both sides along groove, with a spine at bifurcation of costa of segments; veins conspicuous and prominent on both surfaces, contiguous, oblique, 2-forked; lamina brown-green to pale green, herbaceous when dried.

Evergreen forests; 700-1200 m. Guangdong, Guangxi, Guizhou, Yunnan [Cambodia, Thailand, Vietnam].

The authors have not seen material of Pteris decrescens var. remotipinnulata Ching (Sinensia 1: 10. 1929).

1 Lateral pinnae 10-15 pairs, caudate apex 1.5-2(-3) cm, basal pinnae gradually shorter, 5-7 cm, middle 8-10 ?2-3 cm, slightly shorter upward.   47a var. decrescens
+ Lateral pinnae 12-14 pairs, ca. 7 ?1.3 cm, caudate apex 3-4 cm, basal pair almost not shortened.   47b var. parviloba

Lower Taxa


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