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1. AzollaLam. Watek-fern. 



Sporocarps in pairs. Macrosporangia 1- 

 spored. Aquatics, moss-like, floating, green 

 or purplish. 



1. A. Caroliniana Willd. — Presidio. Sau- 

 celito. 



Order 2. FILICES. Isosporous. Spor- 

 angia formed from the epidermis, bursting by 

 an elastic ring. Fronds without stipules. Ver- 

 nation circinate. 



Family 1. POLYPODIACEiE. 



Sporangia hjpophyllous, somewhat globular; 

 ring vertical. 



1. Gymnogramme Desf. Gold -fern. 

 Sori linear, placed on branching primary 

 veins. Indusium 0. — 71. 



1. G. TRIANGULARIS Kaulfuss. — Common. 

 2, Cheilanthes Swartz. Lipfeks. 



Sori placed separately at the end of veinlets. 

 Spurious indusium rudimentary, formed by the 

 reflexed margin of the frond. — U- 



1. C. Californica Nutt. Fronds green on 

 both sides, 4-pinnatifid. — Tamalpais. 



2. C. MYRIOPHYLLA Desv. Fronds covered 

 underneath with brown scales; 3-4-pinnate. — 

 Wright's Station. 



