长柄假脉蕨 chang bing jia mai jue

Didymoglossum latealatum Bosch, Ned. Kruidk. Arch. 5: 138. 1863; Crepidomanes chui Ching & P. S. Chiu ["chiuii"]; C. insigne (Bosch) Fu; C. makinoi (C. Christensen) Copeland; C. omeiense Ching & P. S. Chiu; C. paucinervium Ching; C. plicatum (Bosch) Ching; C. racemulosum (Bosch) Ching; C. smithiae Ching; C. tagawanum K. Iwatsuki; C. tiendongense Ching & C. F. Zhang; C. yunnanense Ching & P. S. Chiu; D. insigne Bosch; D. plicatum Bosch; D. racemulosum Bosch; Trichomanes acutilobum Ching; T. acutum Makino ex Christ (1892), not C. Presl (1843); T. bipunctatum Poiret var. insigne (Bosch) Beddome; T. bipunctatum var. latealatum (Bosch) C. B. Clarke; T. bipunctatum var. plicatum (Bosch) Beddome; T. insigne (Bosch) Beddome; T. latealatum (Bosch) Christ; T. makinoi C. Christensen.

Plants 2-14 cm tall. Rhizome dark brown, 0.5-1.2 mm in diam., densely covered with dark brown short hairs, irregularly branching. Stipes remote, 0.8-5 cm apart, dark brown or green-brown, 0.5-3 cm × ca. 0.5 mm, wingless or winged throughout, wings usually ciliate. Rachis and costae light brown to light black or dark green, winged throughout, slightly zigzag, glabrous. Lamina bipinnate to tripinnatifid, ovate to oblong or triangular, 2-10 × 1-5 cm, membranous, glabrous, base cuneate to subcordate, apex acuminate to obtuse; pinnae 5-12 pairs, closely spaced or slightly imbricate to neighboring ones, alternate, sessile, ovate to oblong-lanceolate or triangular-ovate, 0.5-3 cm × 4-18 mm, base unequally cuneate, margin parted, apex obtuse; ultimate segments closely spaced, linear to lanceolate or broadly cuneate, 1-5 × 0.4-3.5 mm, margin entire, somewhat crisped, apex obtuse to acuminate. Veins dichotomous, obviously raised on each surface, dark brown, light black, or green, glabrous. Sori on upper parts of frond, apical on short acroscopic segments, 1-6 per pinna; involucres tubular, elliptic, or obconic, 1.5-2 × 0.5-1 mm, acute at apex, winged or wingless, dilated at mouth, lobed to 1/3, lips triangular or broadly circular; receptacles projecting, brown, 2-3 mm.

On wet rocks or on tree trunks in forests; 100-2800 m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hunan, Jiangxi, Sichuan, Taiwan, Xizang, Yunnan, Zhejiang [Bhutan, N India, Japan, Malesia, Nepal, Sri Lanka, Vietnam; Australia].

Crepidomanes latealatum is a widespread, variable species, especially in the form and size of the fronds; thus, many names have been proposed. No material of C. zayuense Ching & S. K. Wu (Fl. Xizang. 1: 51. 1983, from Zayü) has been seen by the present authors, but the description in the protologue suggests that it belongs within this species.