70 



fig. 8 magd. ; 1-5: pericentral cells sourrounding the central cells which 

 are shown with thicker lines, J * 3 . Fig. 10: portion of branch having 5 

 siphons, showing stichidia arising from both polysiphonous, a, l>, and 

 monosiphonous bases, c, d, 4 " . Fig. 11 : stichidia arising from poly- 

 siphonous base (4 siphonous frond) of pinnule, -*f . Fig. 12 : surface 

 view of a sticidium, ri 3 . Fig. 13: pinnule bearing finger-like lacineae, 

 340 pig 14 . C y S tocarp (4 siphonous frond), ] J . Fig. 15: vertical 

 section of a cystocarp, ^ . Fig. 16 : spore-filaments, "'^". 



Heterosiphonia japonica Yendo.' 



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