126 VI. POLYPODIACEAE. § 2. ASPIDIEAE. 



3.3. Sori scattered irregulary or placed in 2 rows between 

 the main veins. Indusium round or reniform, and if 

 oblong then at best 2 X as long as broad and the 

 fronds not simple. 



'*. Excmrent soriferous free veinlets 2 — 5 to each 

 areola. Sori not compital. Indusimu round. 



No. 26. Cyi'tomium. 

 A.S:. Excurrent soriferous free veinlets wanting or 1 

 to each areola, or the soriferous veinlets spreading 

 in^ various directions. Sori often compital. In- 

 dusium round or reniform. No. 25. ALSpidium. 



§ 3. DAVALLIEAE. 



t. Sori solitary and terminal t»n the veins; indusium attached by a very 

 narrow base to the apex of the vein only, otherwise free, the outer edge 

 lacerato-lobate. No. 516. lieptolepia. 



1.1. Sori solitary and dorsal or terminal on the veins, or uniting the apices 

 of '1 or more veins; indusium attached by a broad base or by the base 

 and sides to the vein and the parenchyma, the outer edge rather entire. 

 2. Fronds divided; leaflets dimidiate, i. e. the half on the lower side 

 of the midrib cut away. No. 29. I^indsaya. 



S.S. Fronds simple or divided, if divided the leaflets not dimidiate. 



3. Stipes articulate to the rhizome; rhizome scaly. Sori roundish 

 or oblong, solitary on the vein tips. 



1:. Indusium fastened by a broad base, the sides and outer 

 edge free. No. 52. Hiiniata. 



A.A. Indusium fastened by the base and sides, the outer edge 

 free. No. 54. Ilavallia. 



3.3. Stipes not articulate to the rhizome ; rhizome hairy, scaly or 

 ' fibrillose. 

 a. Sori occupying the broad apex of the ± cuneate ultimate 

 segments. No. 28. Odontosoria. 



a.a. Sori not as in a. Ultimate segments not ± cuneate. 

 h. Sori uniting the tips of 2 or more veins or veinlets. 



5|c. Fronds pinnate, pinnae articulate to the rachis. 



(No. 17. Xephrotepis, § Lindsay opsis). 



*.*. Fronds simple or divided, if divided/ the leaflets 

 not articulate to the rachis. 



No. 50. Sehizoloma. 



