( 332 ) 



3, Allosorus Benth. (Pellcealjiuk.) KOCK-BRAKK. 



Sporangia on veins which are oblique to the 

 midrib. Spurious indusium continuous, formed 

 by the reflexed margin of the frond. It. Gla- 

 brous, cespitose ; fertile fronds contracted ; 

 petioles not green. 



1. A. ANDROMEMSFOLIUS Fee. Pinnules oval, 

 obtuse. San Rafael. Tamalpais. 



2. A. ORNITHOPUS Hook. Pinnules rhom- 

 boid, mucronulate. Piedmont. Lagunitas 

 reservoir. 



3. A. DENSUS Hook. Pinnules linear, mu- 

 cronate. Lagunitas reservior. 



4, Poly podium L. POLYPODY. 

 Sori round, placed on the veins. Indusium 

 0. K. 



1. P. VULGARE L. Veins of the segments 

 uniformly free and none anastomosing. Com- 

 mon. 



2. P. SCOULERI Hook & Gray. Veins of 

 the segments anastomosing by ve inlets. Sau- 

 celito. Tamalpais. 



5 Pteris L. BRACKKX. BUAKE. 



Sporangia at the end of the veinlets, con- 

 nected into a vein-like receptacle which sur- 

 rounds the frond without interruption, indu- 

 sium continuous, membranaceous, attached at 

 its marginal side, free on its inner side. 2 . 



