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rib. Indusium coriaceous, attached to the re- 

 ceptacle, and opening at the inner side. 2. 



1. W. RADICANS 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. FILIX FCEMINA 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. It . 



1. A. RIGIDUM Swartz. Indusium reniform ; 

 fronds 2-pinnate. Common. 



Specific against the tapeworm, like its Euro- 

 pean congener, A. Filix mas. 



2. A. MUNITUM Kaulfuss. Indusium pel- 

 tate; fronds pinnate, pinnae serrate. Com- 

 mon. 



3. A. ACULEATUM Swartz. Indusium pel- 

 tate; fronds 2-pinnate, sometimes simply pin- 

 nate, the pinnae deeply cut. Tamalpais. 



2. Cystopteris Bernh. BLADDER-FERN. 

 Sori round, placed on the middle of the vein- 

 let, solitary in the disc of the lacinia. Indu- 



