ICONES FILICUM SINICARUM 
PLATE 90 
COLYSIS BONII Ching 
POLY PODIACEAE 
cOLysis BONII Ching, Bull. Fan Mem. Inst. Biol. 4: 322 (1933). 
Rhizome creeping, 3 mm thick, hypogaeous; scales fusco-brown, thin, ovate, long- 
acuminate, spreading; frond subdimorphous, 1 cm apart, erect, stipe 8-18 cm long, 
straminous, sterile lamina 16-27 cm long, 3.5-5 cm broad, or sometimes much narrower, 
lanceolate, acuminate, base rotundo-cuneate, narrowly decurrent for some distance 
downward, margin entire but crispo-repand; texture firm, thickly chartaceous, color light 
green; lateral main veins and veinlets quite distinct; fertile lamina on longer stipe, not 
much different from the sterile but in somewhat narrower lamina with more undulato- 
repand margin; sori linear, continuous, flexuose, very oblique, from costa extending to 
the margin, 4 mm. apart. 
Hainan: Nam Kao, Eryl Smith 1516, 1517, January 19, 1923; Dai Land, 
Dung Ka, C. I. Tso & N. K. Chun 43945, Sept. 25, 1932, on moist rocks by 
streams. 
Tonkin occid: Bon 2395 (type). 
The present fern seems to bea close ally to the Malayan C. membranacea (BI.) 
Presl and C. Wrightii (Hooker) from South China and the island Formosa, differs from 
both in much thicker texture, and long-stalked frond with broad and shortly decur- 
rent base. From the latter it further differs in light-green leaves instead of invariably 
turning obscurely blackish upon drying. 
Plate go. Fig. 1. habit sketch (natural size). 2. scale from rhizome (X50). 
