ICONES FILICUM SINICARUM 
PLATE 239 
POLYSTICHUM GROSSIDENTATUM Ching 
ASPIDIACEZ: 
\ 
POLYSTICHUM GROSSIDENTATUM Ching, sp. nov. 
Species distinctissima ab omnibus affinibus adhuc cognitae in China differt frondis apicem versus grada- 
tim in cauda lineari longe attenuatis, pinnis lateralibus trigonis, marginibus superioribus grosse et irregulari- 
ter dentatis. 
Rhizome short, erect, densely radicose, crowned at the apex with dense, dark brown, ovate, long- 
acuminate scales having erosed margin; fronds caespitose, many together, stipe 8-14 cm long, gray- 
stramineous, subglabrous with a few similar scales above the base, otherwise the entire plant glabrous, lamina 
25-30 cm long, 2.5 cm broad at the middle, 3 cm broad at the base, linear-lanceolate, gradually long-attenuate 
towards the caudate apex, base not narrowed, pinnate; pinnae about 40 pairs, petiolulate, patent, the lower 
ones separated by broad sinuses, the basal pair slightly larger than those above, 1.5 cm long, 1 cm broad at 
the base, triangular, mucronately acute, base cut straight below, truncate above, the upper and the outer 
margins coarsely and irregularly dentate with mucronate apex, the middle pinnae smaller, about 1.2 cm 
long, and thence gradually diminish upward; zexture chartaceous, dry brownish green, rachis and both sides 
glabrous; veins distinctly raised below, obscure above, pinnate in the anterior base, triforked in the larger 
teeth, forked or simple in the upper smaller teeth; sori large, intramarginal, contiguous, indusiate. 
Southeastern Szechuan, You-yang Hsien, Tung-koo-tant, on the border of Kweichow, Hou Shou Yu 
825. 
This is one of the most distinct species of the group of P. deltodon (Baker) Diels by possessing trian- 
gular pinnae with coarsely and irregularly dentate margin and the gradually long-attenuate caudate apex 
of the fronds. In general habit, our new species resembles Polystichum yaeyamense Makino from the Liu- 
kiu Islands (see Ogata, Ic. Fil. Jap. 7: t. 343. 1936), but differs in much larger size and caudate fronds. 
Plate 239. 1. Habit sketch (natural size). 2. Basal pinna, showing venation and position of sori CX=4): 
3. Middle pinna (X 4). 4. Scale from the base of stipe (X 40). 5. Sporangium with spores (X 100). 
