ICONES FILICUM SINICARUM 
PLATE 218 
ADIANTUM FENGIANUM Ching 
ADIANTACE: 
ADIANTUM FENGIANUM Ching in Bull. Fan Mem. Inst. Biol. New Series 1: 267. 1949; in Acta 
Phytotax Sinica 6: 328. 1957. 
Adiantum fimbriatum Christ in Bull. Soc. Bot. France 52: Mém. I. 62. 1905; C. Chr. Ind. Fil. 661 1905: 
(pro parte). 
Rhizome slender, creeping, oblique, clothed in dark brown, linear-subulate small scales; fronds pro- 
ximate, numerous, stipe capillary, weak, light castaneous, glabrous above the base, 4-6 cm long, lamina 
nearly as long as the stipe, 1-2 cm broad, narrowly oblong, obtuse, bipinnate; pinnae 5-6 pairs, 15-20 mm 
long, 7-10 mm broad, petiolate, very oblique, subimbricate, pauci-pinnate or 2-3-foliolate under the simply 
pinnate and short apical part; wltimate pinnules all similar, 35 mm long, 2-4 mm broad, fan-shaped, cuneate, 
truncate or subrounded along the upper margin and deeply dentate with 7-10 elongate, deltoid teeth having 
rather bluntish apex; texture pellucido-herbaceous, dry green, glabrous on both sides; veins distinct, fine, 
dichotomously forked with one veinlet to each tooth; sori one to each pinnule, transversely oblong, 
straight, nearly as long as the width of the outer margin except for the 1-2-toothed sterile edge on each side, 
indusium thin, whitish, entire, with straight, slightly wavy margin, persistent. 
Northwestern Yunnan: Chi-chung-loo, Chu-koo Snow Mountain, N.E. of Likiang city, upon wet 
rocks under forest, K. M. Feng 9206, August 29, 1942, alt. 3400 m.; Bois de Santcha Ho, Delavay 1, June 
17, 1887 (A. fimbriatum Christ, pro parte). 
This distinct endemic species is one of the smallest and most elegant of the group of A. venustum 
Don, not easily to be confounded with any other species by dint of its delicate and very small stature. 
Attention may be called to the striking feature of the sporangium which has a very broad annulus con- 
sisting of over 40 incrassate cells and the short stalk, while other species under observation generally has 
long-stalked sporangia with narrower annulus of about 20 thickened cells. 
Plate 218. 1. Habit sketch (natural size). 2. Two ultimate pinnules, showing sori and indusia (X 10). 
3. Sterile pinna, showing venation and dentate margin (X 10). 4-5. Scales from the rhizome (X 30). 6-7. 
Sporangium with spores (X 100). 
