442 
Fig. 83. Phceostroma parasiticum nov. sp. a transverse section of the lamina of a Laminaria with Phceostroma 
parasiticum nov. sp.; b, c portions of the margin; e part of filament with young plurilocular sporangia; 
g, f plurilocular sporangia; h, i unilocular sporangia, a 80:1; b and c 160:1; d 200:1; e, f, g, 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 
