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rib. Indusium coriaceous, attached to the re- 
ceptacle, and opening at the inner side.—2. 
1. W. rapicans Smith.—Common. 
9. Asplenium L. SPLENWORT. 
Sori linear, placed on veinlets. Indusium 
membranaceous, attached laterally to the vein- 
let and opening toward the mid-rib.—2¢. 
1. A. Fir ramina Bernh.—Marine Hospi- 
tal. Tamalpais. ‘ Lady-fern.” 
10. Aspidium Swartz. SHIELD-FERN. 
Sori round, placed at the end of the veinlets. 
Indusium umbilicate, free on all sides and af- 
fixed by a column.— 2. 
1. A. Rictipum Swartz. Indusium reniform; 
fronds 2-pinnate.—Common. 
Specific against the tapeworm, like its Huro- 
pean congener, 4. Filix mas. 
2. A. monitum Kaulfuss. Indusium pel- 
tate; fronds pinnate, pinne serrate.—Com- 
mon. 
3. A. acuLEaATuM Swartz. Indusium pel-* 
tate; fronds 2-pinnate, sometimes simply pin- 
nate, the pinnz deeply cut.—Tamalpais. 
2. Cystopteris Bernh. BLappDER-FERN. 
Sori round, placed on the middle of the vein- 
let, solitary in the disc of the lacinia. Indu- 
