240 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE XXIL 



Diagrams illustrating Formation of Reproductive Bodies. 



Fig. 23. Cube, representing cell of Porphyra sp., which has undergone a 

 cruciate division perpendicular to the surface of the frond. For- 

 mula for sporocarps, 4 ( — , — , c) . 



Fig. 24. The same, after undergoing a division parallel to the surface of the 



2 22 



Fig. 25. The same after undergoing another cruciate division perpendicular 

 to the surface of the frond in all segments. Formula for sporo- 



frond in each segment. Formula for sporocarps, 8 ( — , — , — )• 



carps, 32 (-, -, -); for antheridia, 8 (l^-'^, Al, f-) 



^442' ^2 '22'' 



Fig. 26. The same after undergoing another division parallel to the sur- 

 face of the frond in all segments. Formula for sporocarps, 



64 (^, A, ^) ; for antheridia, 16 (Jl^, AA, f.) . 

 4 4 4^ - 2 24' 



Fig. 27. The same after undergoing another cruciate division perpendicular 



to the surface of the frond in all segments. Formula for anther- 



idia, 64 i^^. iiA, ±). 



\ 4 4 4 ^ 



Fig. 28. The same after undergoing another division parallel to the sur- 

 face of the frond in all segments. Formula for antheridia, 



^ 4 ' 48^ 



