(332) 



3. Allosorus Beuth (Pe^/oea Link.) Kock-Brake. 



Sporangia on veins which are oblique to the 

 midrib. Spurioas indnsium continuous, formed 

 by the reflexed margin of the frond. — U- Grla- 

 brous, cespitose ; fertile fronds contracted ; 

 petioles not green. 



1. A. ANDR0MEDJ5F0LIUS Fee. Pinnules oval, 

 obtuse. — San Rafael. Tamalpais. 



2. A. ORNITHOPDS Hook. PiuDules 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 

 O.—U. 



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 veinlets. — 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. — U. 



