56 CALIFORNIA ACADEMY OF SCIENCES. LPROc. .^d Ser. 



EXPLANATION OF PLATE VL 



Nitophylluni ruprechtianum . 



Fig. 22. Expanded, membranous frond, sterile. One-tifth natural size. 

 Fig. 23. Examples of weathered and proliferating plants. One-fifth natural 



size. 

 Fig. 24. Slender, much prolonged type, minutely proliferating along margin, 



sori on proliferations. One-fifth natural size. 

 Fig. 25. Typical plant, showing stalk, branching, venation, and proliferations, 



with sori on proliferations. One-fifth natural size. 



