462 
Notes. 
have not been observed, that I collected a quantity of material for 
microscopic investigation, preserving it for this purpose in 3 per cent, 
formol. 
A few weeks ago, when examining a series of sections prepared 
from this material, after being hardened in alcohol, stained in bulk 
in Delafield’s haematoxylin, and embedded in paraffin in the usual 
way, I found a small number of plurilocular sporangia taking the 
place of a number of peripheral filaments, in close proximity to uni- 
locular sporangia, both occurring on the same plants. At first I was 
in doubt as to their real character. In one section the plurilocular 
Unilocular and plurilocular sporangia. 
sporangia were observed to arise more or less at right angles from 
a basal filament running nearly parallel to the surface of the thallus, 
recalling the characters of a parasitic Ectocarpus or Streblonema grow- 
ing attached to its host-plant ; on more careful observation, however, 
I convinced myself of the direct transformation of the peripheral 
filaments giving rise to these sporangia, which were much fewer in 
number than the unilocular sporangia. They varied as regards shape 
and size, measuring from -0459 mm. to -1134 mm. long, the average 
breadth being -0108 mm. 
An interesting point observed in the sporangia is the difference in 
size between the loculi of the same sporangium ; and since each 
loculus usually contains but a single zoospore, there is a corresponding 
