齿牙毛蕨 chi ya mao jue

Polypodium dentatum Forsskål, Fl. Aegypt.-Arab. 185. 1775; Christella dentata (Forsskål) Brownsey & Jermy; Cyclosorus angustus Ching (1982), not (Copeland) Ching (1941); C. fengii Ching ex K. H. Shing; C. jiulungshanensis P. S. Chiu & G. Yao ex Ching; C. mekongensis Ching ex K. H. Shing; C. mianningensis Ching ex K. H. Shing; C. paradentatus Ching ex K. H. Shing; C. pingshanensis Ching & H. S. Kung ex K. H. Shing; C. proximus Ching; C. shapingbaensis Ching ex K. H. Shing; C. stenopes Ching & K. H. Shing; C. wangii Ching; Dryopteris dentata (Forsskål) C. Christensen; D. oblancifolia Tagawa; Thelypteris dentata (Forsskål) E. P. St. John.

Plants (20-)40-60(-100) cm tall. Rhizomes suberect to shortly creeping, apices including bases of stipes with brown linear-lanceolate scales. Fronds subclustered; stipes (5-)10-20(-35) cm, bases dark brown, stramineous distally; laminae (10-)15-40(-60) × 10-20 cm, bases slightly narrowed, apices acuminate; lateral pinnae 10-20 pairs, proximal 2 or 3 pairs slightly shortened; middle pinnae lanceolate to oblanceolate, 5-10 × (0.8-)1-2 cm, bases rounded-truncate, lobed 1/2-2/3 toward costae, apices acuminate; segments 10-20 pairs, rectangular or oblong, 3-5 × 3-4 mm (basal acroscopic one slightly longer, sometimes crenate), rounded-obtuse at apices; veinlets 5-8 pairs per segment, proximal pair anastomosing, next 0.5-1 pair running to sinus membrane. Laminae herbaceous to papery, brownish green when dried, shortly hairy adaxially, along veins with several acicular hairs, densely puberulent abaxially, sometimes with glandular hairs. Sori orbicular, medial; indusia shortly hairy. Sporangia bearing minute golden glands on stalks. Spores brown, irregularly cristate. 2n = 72, 144, 288.

Habitat variable, usually semi-open to open places; near sea level to 2800 m. Chongqing, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hunan, Jiangxi, Sichuan, Taiwan, SE Xizang, Yunnan, S Zhejiang [N Africa, tropical America, tropical and subtropical Asia].

The type of Cyclosorus longqishanensis K. H. Shing (FRPS 4(1): 337. 1999) has features intermediate between C. dentatus and C. acuminatus. Only one gathering (the type) with few sori has been collected. This taxon might be a hybrid.

The type of Cyclosorus wenzhouensis K. H. Shing & C. F. Zhang (FRPS 4(1): 341. 1999) resembles C. dentatus but differs in having a larger laminar outline and 2 pairs of veinlets joined beneath the sinuses. Only one gathering (the type) with irregular spores has been collected. This taxon might be a hybrid.