S12 



CLXIII. ALG^:. 



1 i-MII li 



1 Hil if 

 Iff pi ; 





C T yy. 



■941. Clostekium Leiblenii, Kuetz. 



(a) Living cells, (b) an empty cell, (c) zygospore. (After Cooke.) 



<942. PENIUM MARGAR1TACEUM, Brcb. 



(a) Living fronds, (b) empty fronds, (c) zygospore. 



943. P. cucukbitinum Biss., var. subpolymorphum, Nordst. (x 570). 

 (After Nordstedt.) 



947. Cosmarium sulcatum, Nordst., var glabrum, Borge (x 740). (After 



Borge.) 



948. C. pseudoprotuberans, Kirchn., var. angustus, Nordst. (x 570). 



(After Nordstedt.) 

 049. C. pseuboprotuberans, Kirchn., var. tumidum, Borge (x 740). (After 

 Borge.) 



