ICONES FILICUM SINICARUM 
‘ 
PLATE 235 
POLYSTICHUM YUANUM Ching 
ASPIDIACEZ 
POLYSTICHUM YUANUM Ching, sp. nov. 
Species gregis Polystichi stenophylli Christ, differt fronde apice haud gemmifera radicanteque, pinnis 
subrhomboidis, valde deflexis, basi anteriore paulo auriculatis, nec pectinato-confertis sed spatio sat lato sese 
separatis, facie inferne subglabra et apice solomondo brevissime mucronatis, 
Rhizome short, erect, densely radicose and together with stipe sparsely clothed in dark brown, broadly 
ovate, acuminate, denticulate scales; fronds caespitose, stipe 7-9 cm long, stramineous, sparsely scaly or sub- 
glabrous upward, lamina 20-30 cm long, 3 cm broad, linear-lanceolate, acuminate, gradually narrowed 
downward, pinnate; pinnae 25-30 pairs, alternate, separated by a broad sinus from each other, strongly de- 
flexed, lower ones gradually abbreviated, the lowest pair about 5 mm each way, triangular, the middle 
ones ‘1-12 cm long, 6-7 mm broad at the base, thomboid-triangular, base unequal, cut straight below, 
truncate above with a small acute and mucronate auricle, margin crenato-serrate with short teeth; texture 
chartaceous, dry brownish, rachis and both sides quite glabrous; veins visible below, obscure above, forked 
except the anterior basal one which is pinnate, while the posterior basal one is simple; sori small, medial, 
terminal on the anterior veinlet of each group and generally confined to the outer part, 3-5 above and 13 
below the costa, indusiate. 
Northwestern Yunnan: Chungtien Hsien, Chiren, T. T. Yi 11286, on rock surface, alt. 2200 m., May 
Ist, 1937. 
A very distinct species of the group of P. deltodon (Baker) Diels, especially related to P. stenophyllum 
Christ, from which it differs in characters diagnosed above. ; 
Plate 235. 1. Habit sketch (natural size). 2. Pinna, showing venation and position of sori (X 4). 3. Scale 
from the base of stipe (X 30). 4-5, Sporangium with spores (X 100). 
