( 332 ) 
8. Allosorus Benth. ( Pellea Link.) Rocx-Brakz. 
Sporangia on veins which are oblique to the 
midrib. Spurious indusium continuous, formed 
by the reflexed margin of the frond.-—2¢. Gla- 
brous, cespitose ; fertile fronds contracted ; 
petioles not green. 
1.. A. ANDROMEDHFOLIUS Fée. Pinnules oval, 
obtuse.—San Rafael. Tamalpais. 
2. <A. opnitHorpus Hook. Pinoules rhom- 
boid, mucronulate.— Piedmont. Lagunitas 
reservoir. 
8. A. DENsUS Hook. Pinnules linear, mu- 
cronate.—Lagunitas reservior. 
: 4. Polypodium L. Potypovy. 
Sori round, placed on the veins. Indusium 
0.—2. 
1. P.vunrcarzE L. Veins of the segments 
uniformly free and none anastomosing.—Com- 
mon. : 
2. P. Scouterr Hook & Gray. Veins of 
the segments anastomosing by veinlets.—Sau- 
celito. Tamalpais. 
5 Pteris L. Bracken. Brake. 
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,. 
