(381 ) 
l. Azolla Lam. WATER-FERN. , 
Sporocarps in pairs. Macrosporangia 1- 
spored. Aquatics, moss-like, floating, green 
or purplish. 
1. A. Caronintana Willd.—Presidio. Sau- 
celito. 
Orper 2. FILICES. Isosporous. Spor- 
angia formed from the epidermis, bursting by 
an elastic ring. Fronds without stipules. Ver- 
nation circinate. 
Family 1. POLYPODIACEA, 
Sporangia hypophyllous, somewhat globular; 
ring vertical. : 
1. Gymnogramme Desf. Gotp-rery. 
Sori linear, placed on branching primary 
veins. Indusium 0.—2f. 
1. G. TRIANGULARIS Kaulfuss.—Common. 
2. Cheilanthes Swartz. Lip-rzry. 
Sori placed separately at the end of veinlets. 
Spurious indusium rudimentary, formed by the 
reflexed margin of the frond.—2. 
1. C. Cattrornica Nutt. Fronds green on 
both sides, 4-pinnatifid.—Tamalpais. 
2. ©, MYRIOPHYLLA Desy. Fronds covered 
underneath with brown scales; 3-4-pinnate.— 
Wright’s Station. 
