ICONES FILICUM SINICARUM 
PLATE 07 
POLYPODIUM DIELSEANUM C. Christensen 
POLYPODIACEAE 
POLYPODIUM DIELSEANUM C. Chr. Ind. Fil. 522 (1906). 
Polypodium leuconeuron Diels (non Christ, 1900) in Engl. Jahrb. 29: 203 (gor). 
Polypodium Wilsonit Christ, Bull. Acad. Géogr. Bot. (1906) 104. 
Rhizome wide-creeping, rather thick, densely scaly; scales fusco-brown, imbricate, 
ovate-lanceolate, minutely denticulate, with large clear luminae and thin walls; frond 
distant, stipe 8-12 cm long, straminous or light castaneous, glabrous, lamina oblong- 
ovate, 25-35 cm long, to 15 cm broad at base, pinnate, truncate at base, caudate at 
apex, pinnae 12-20 pairs, patent, linear, apex obtuse, margin crenate-serrate, adnate 
and somewhat dilated above base, far apart, the greater part of rachis between pinnae 
wingless; texture chartaceous, color green, moderately villose on both sides of rachis and 
upper side of lamina; venation distinct, veins in pinnae anastomosing in one row of 
areolae on each side of costa, beyond which veinlets are free; sovz small, one-rowed, naked. 
Szechuan: Nanchuan, Tanchiawan, von Rosthorn 398 (type); Mt. Omei, E. H. 
Wilson 5336; P. W. Fang 2736, 2745; O-pien Hsien, P. W. Fang 8066, 8474, 8502, 8708, 
6673. 
Closely allied to P. amoenum Wallich, differs by narrowly linear pinnae with 
peculiarly dilated base being widely separated by wingless rachis. In habit it resembles 
P. subauriculatum Blume, but differs in rhizome being not epigaeous, nor glaucous, nor 
subnaked, in much smaller size and more or less adnate pinnae. 
Plate 97. Fig. 1. habit sketch (natural size). 2. lateral pinna, showing venation and position 
of sori (x3). 3. scale from rhizome (X50). 
