6o CALIFORNIA ACADEMY OF SCIENCES. [Proc. .^d vSer. 



EXPLANATION OF PLATE VI I L 



Nitophyllunt violaceuni. 



Fig. 31. Intermediate form, showing segments of frond, with crispate mar- 

 gin and marginal sori. One-fifth natural size. 



Fig. 32. Typical form, showing slender, linear branches, marginal prolifer- 

 ations, and sori forming linear patches along margin or rounded 

 patches on the proliferations. One-fifth natural size. 



Fig- 33- Intermediate form, with branches fiabellately expanded at ends; 

 sori as in preceding figure. One-fifth natural size. 



Fig. 34. Robust, membranous form, sterile. One-fifth natural size. 



Fig- 35- Reduced and weathered form, the conspicuous sori placed singly 

 or together along the margin, or borne on proliferations. One- 

 fifth natural size. 



Fig. 36. Weathered form, as in preceding figure. One-fifth natural size. 



Fig. 37. Finely dissected form. One-fifth natural size. 



