■] FILICES. 461 



Common in ravines, Champion and others. In Assam, S. China, and the Sandwich 

 Islands. The number of sori to each segment, and the proportion of simple and forked 

 veins, is very variable on the same specimen. 



23. DAVALLIA, Sm. 



Son inserted at the end of a vein at or very near the margin, globular, con- 

 tained in a more or less cup-shaped indusium, more or less adnate to the frond, 

 and open at the free truncate top, next to the margin of the frond. — ^Rhizome 

 usually creeping. Fronds simple, pinnate, or decompound. Veins forked 

 and diverging from a more or less prominent midrib. 



A large genus, chiefly tropical or subtropical, common to the New and the Old World, 

 but more abundant in the latter. 



Fronds triangular, pinnate or pinnatifld, coriaceous, 2 to 3 in. long . 1. D.pedata. 

 Fronds simply pinnate, pubescent, with long lanceolate segments . 2. D. Mooheriana, 

 Fronds decompound, 1 ft. long or more. 

 Fronds glabrous, smooth and shining. 



Sori terminating the lobes . 6. i). temiifolia. 



Sori on the under surface within the margin. 



Sori cylindrical or oblong 4. D. elegans. 



Sori as broad as or broader than long 5. J). OriffitUand, 



Fi'onds pubescent, thin and pale green. Sori in the sinus of the 

 lobes ..... . 3. i). polypodioides. 



1.. D. pedata, Sw.; Hook. Spec. Ml. i. 154, t. 45 A. Ehizome creeping 

 to a considerable length, covered with brown scales. Fronds erect, ovate- 

 triangular, 3 to 3 in. long, on a stipes about as long, cordate at the l)ase, 

 coriaceous, deeply pinnatifid or pinnate at the base. Segments oblong-lan- 

 ceolate, obtuse, sinuate or the lower pair pinnatifid. Veins forked, coalescing 

 into a central one not more prominent than the branches. Sori close to the 

 margin, towards the ends of the segments. Indusium nearly orbicular. 



Hongtong, Hinds, Dill, Wright; on a rock at the top of Victoria Peak, Wilford. In 

 the Mauritius, Ceylon, Silhet, and the Indian Archipelago. 



' 2. D. Hookeriana, Wall.; Hook. Spec. Fil. L 172, t. 47 B. Fronds 

 1 to 2 ft. high, simply pinnate, pubescent. Pinnae lanceolate, serrate, 2 to 4 

 in. long, truncate at the Tjase, with a prominent angle or lobe on the inner 

 side, diminishing from the lowest pair to the pinnatifid apex. Veins forked, 

 num'erous, parallel, from a prominent midrib. Sori in a row just withm the 

 margin of the segment. Indusium broad and short. 



In the path to Poke.Fallum, Tfrquhart. In Knmaon, Silhet, and Khasia. 



3. D. polypodioides, Don; Hook. Spec. Ml. i. 181. Ehizome creep- 

 ins Fronds 2 to 3 ft. high, twice or thrice pinnate, light green, flaccid, and 

 more or less pubescent. Primary pinnae distant the 1 or 2 lowest PP. smaller 

 than the following, which axe often 6 in. to 1ft. long, gradual y dimmisMng 

 to the apex. Segments from lanceolate to oblong or obovate, the larger ones 

 deeply lobed, with obovate obtuse lobes. Sori solitary under each sinus of 

 tSLd segments or near the margin of the entire ones. Indusium short 



^""commotm ravines, Ursukarf, Wilford. Widely spread over the tropical and subtropical 

 regions of the Old World, appearing also in tropical Amenca. 



4.- D. elegans, Sw. ; Hook. Spec. Ml. i. 164. Bhizome creeping, thick. 



