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THE BOTANICAL MAGAZINE. 
[Vol. WIT. November 10, 1898. | NO. S1.] 



Tetraspores of Desmia, 
K, Okamura. 
ec 
I am not certain whether the tetraspore of Desmia is already known or not. But as it is not des- 
ek 
出 | x 
cribed in J. Agardh’s Sp. Alg vol. III. p. 354, I will here describe what I have seen in Desmia japonica 
Haw., one of our common species in the 
a 
warmer part of the Pacific coast. The 
al 
tetraspores originate from minute colord 
cortical cellules forming roundish patches, 
which are often confluent and of a more or 

less irregular form. At first cortical cellules 
elongate and rise up above the surface of the frond forming a flat elevation, and afterwards each cellule is 
S24) 
transformed by transverse partitions into a zonally divided tetraspore. It is oblong-cylindrical, 26—44 yu. 


_ Tetraspores of Desmia. 

