ICONES FILICUM SINICARUM 
PLATE 164 
ONYCHIUM IPII Ching 
POLYPODIACE/Z 
ONYCHIUM IPI Ching, Lingnan Sci. Journ. 15: 282 (1936). 
Rhizome wide-creeping, 2 mm _ thick; scales imbricate, lanceolate, atro-brown, 
nitente; fronds approximate, stipe slender but firm, erect, pale green, naked, sulcate above, 
10-20 cm long, lamina narrowly lanceolate with deltoid base, attenuate towards apex, I0- 
20 cm long, 3-7 cm broad, tripinnate at base, simple pinnate towards apex; pinnae 10 13- 
jugate, basal ones much the largest, 4-7 cm long, 3-4 cm broad at base, deltoid, long- 
acuminate, oblique, petiole to 1 cm long; pinnules subrhombic, acute, 1.5 cm long, I cm 
broad, petiolulate, pinnatisect; segments rhombic, below 5 mm long, anterior basal one 
much the largest, lobato-incised with 2-4 acute soriferous teeth, the middle pinne 
lanceolate, to 3 cm long, about I cm broad, very oblique, bipinnatifid; texture rigidly her- 
baceous, light green and glabrous on both sides; veins prominently raised, pinnate, one 
to each soriferous tooth; sori short, 2mm long, indusiwm conforms, gray, membranaceous, 
entire, completely covering sorus. 
Hupeh: Koo Chen Hsien, Wu Leng Shan, K. C. Chow 3982, Oct. I4, 1935, in shade. 
This endemic species is closely related to 0. mou pinense Ching, differs in its de- 
cidedly slender habit with uniform fronds, shorter ultimate segments with very short sori. 
Plate 164. Fig. 1a-b. Habit sketch (natural size). 2. Portion of fertile frond, (x 8). 3. Por- 
tion of sterile frond (x 8). 4. Ultimate scgment of fertile frond, showing position of sori and indusium 
(x 16). 5. Scale from rhizome (27). 
