IOCNES FILICUM SINICARUM 



21 



PLATE 



ii. 



POLYSTICHUM DELTODON (Baker) Diels. 



POLYPODIACEAE 



POLYSTICHUM DELTODON (Baker) Diels in Nat. Pfl. Fam. I. 4. 191; C. Chr. Ind. 580 



(1905); Matthew in Journ. Linn. Soc. 39: 385 (1911). 



Aspidium deltodon Baker in Gard. Chron. n. s. 14: 494 (1880). 

 Hemesteum deltodon Leveille, Flore du Kouy-tscheou 496 (1915). 



Rhizome short, erect, scales sparse, small, dark brown, lanceolate, acuminate, 

 membranaceous, basal, rarely extending higher up; stipes tufted (5-10 together), 5-15 

 cm. long, slender, naked, stramineous; frond linear, elongate, simply pinnate, 10-20 cm. 

 long, 2.5 cm. broad, scarcely narrowed downward, glabrous, moderately firm in texture) 

 rachis subglabrous with a few small adpressed deltoid dark brown scales; pinnae close, 

 sessile, 20-25 on each side, quadrate-ovate, cut straight on the inner side and strongly 

 auricled on the upper, apex rounded, cuspidate, denticulate on the upper edge, usually 

 entire on the lower; veins inconspicuous, pinnate, once forked; sori supra-medial, small, 

 dark brown, usually confined to the outer half of the pinnae, 3-6 to a pinna, inducium 

 small, glabrous. 



Distribution: Szechuan, Yunnan, Hupeh, Kwangsi, and also Formosa. 



This fern was first collected by Maries in Ichang Gorge, about 20 li to the west 

 of the city of Ichang, Hupeh. It is closely related to P. auriculatum Presl, differs only 

 in short deltoid pinnae with few short rather stout teeth. 



Plate 11. Fig. 1. Habit sketch, (natural size). 2. A pinna showing venation and sori (x 3). 

 3. A sorus with inducium attached (x 16). 4. A sporangium (x 52). 





