442 



Fig. 83. Phæostroma parasiticum nov. sp. a transverse section of the lamina of a Laminaria with l'liaostroma 

 parasiticum nov. sp. ; b, c portions of the margin; e part of filament with young plurilocular sporangla; 

 g, f plurilocular sporangla; h, i unilocular sporangla. o 80:1 ; b and c 160: 1 ; d 200: 1 ; e, f. </, h, i 270: 1. 



quently occur in Kuckuck's plant. The layer becomes pseudo- 

 parenchymatous solely through the filaments creeping over each 

 other and growing together. I did not find hairs, but it is possible 



