821 
THE PLURILOCULAR ZOOSPORANGIA OF ASPERO- 
COCCUS BULLOSUS AND MYRIOTRICHIA CLAVE: 
FORMIS. 
By T. H. Burraam, A.L.S. 
(Pate 314.) 
A 
included in the Pheosporee or Pheozoosporee are known to possess 
both unilocular and plurilocular zoosporangia, and the number is 
: ts a 
knowledge goes—are confined either to one form o the other. 
Since the copulation of zoospores (gametes) from the plurilocular 
rv 
numerous group of alge may not ultimately prove to possess both 
forms of sporangia. 
Asperococcus Lamour. is a genus which apparently has heretofore 
exhibited only the unilocular form of sporangia. uti ¢ 
sentations of 4. bullosus Lamour., and of these sporangia as seen in 
a section through a sorus, are given in Ktudes Phycologiques (pl. VI) 
d the germination of 
re- 
the zoospores (p. 17). 
In Aug. 1890 I picked up, floating in the sea at Studland, 
Dorset, in the estuary called Poole Harbour, a specimen consisting 
0 fronds arising from one root-disc. Both were worn away at 
epiphyte rather than to the Asperococcus e tudy, 
however, renders it quite clear that they are the true plurilocular 
.b are perpendicular the surface, 
pecimen 
immature plant of the usual kind. On comparison with specimens 
collected a few days afterwards at Swanage the surface view, even 
with so low a power as 100, is perceived to be different. The 
plurilocular sporangia (seen in optical transverse section) are 
smaller, of a warm browa rather than greyish-brown colour; the 
Journat or Borany,—-Vo. 29. [Noy. 1891.] ¥ 
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