ICONES FILICUM SINICARUM 



89 



PLATE 44. 



POLYPODIUM TRIGLOSSUM Baker 





POLYPODIACEAE 



POLYPODIUM TRIGLOSSUM Baker in Kew Bull. (1898) 232; C. Chr. Ind. 571 (1906); 



Matthew in Journ. Linn. Soc. 39: 383 (1911). 



Selliguea tripylla Christ in Bull. Boiss. 6: 878 (1899). 



_ 



Rhizome creeping, epigaeous, clothed with small lanceolate, membraneceous, 

 ferruginous dense scales; stipes subnaked, slender, brown, 30-45 cm. long; frond deltoid, 

 30-40 cm. long, trisect into 3 ascending lanceolate segments, the middle one the largest, 

 to 40 cm. long, the two lateral ones somewhat shorter, 4-5.5 cm. broad, gradually 

 tapering towards both ends, sinuses rounded, cleft down to 2-3 cm. from the base of 

 the frond, margin entire or obscurely undulate; texture chartaceous, green and glabrous 

 above, pale and sparsely clothed near the costa beneath with adpressed membraneceous 

 dark-brown peltate or ovate-cuspidate scales; venations prominent, the lateral veins 

 parallel, erect-patent, extending almost to the margin, intermediate veinlets anasto- 

 mosing copiously into small hexagonal areolae with free included veinlets; sori small, 

 oblong, superficial, scaly, uniseriate or tending to be biseriate along the costa between 

 main veins. 



Distribution: Yunnan. 



The discovery of this beautiful species was indebted to Dr. A. Henry, who found 

 it in the mountain forest in the district of Mile, Yunnan, and so far not yet known 



elsewhere. 



pt 



sori, the presence of ovate-lanceolate dentate-ciliate dark brown scales on the under 

 surface, the strongly dentate and conspicuously clathrate peltate scales in the sori and 

 by the veinlets not forming a distinct series of large areolae. It is perhaps most 

 interesting to note that this species is distinct from most of the members in § Selliguea in 

 rather very short sori, which vary from oblong to almost globular towards the apex of 

 the segments; a few short liner ones are, however, occasionally present near the basal 

 part and very close and parallel or subparallel to the costae. In this respect it is 

 not perhaps without reason to consider it as a linking species between § Selliguea 

 and § Pleopeltis, which generally has sori not more than three times as long as broad. 



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Plate 44. 



Fig. 1. Habit sketch (natural size). 2. A portion of pinna, showing venation and 



sori (x 2k). 3. Scales from rhizome (x 30). 



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