223 
simulans were found growing closely associated and without any 
prairies: and this experience was repeated four days later 
_the Rhizophora-lined shore just east of the entrance to 
about fifteen miles east of the locality just mentioned. Pre- 
viously to that, so far as 1 am aware, the species had been known 
from sterile specimens only, though the species is of common 
occurrence in the West Indies, southern Florida, and Bermuda, 
w On N 
nd was first described as | go as I mber 28, 
the writer collected a few fertile plants of this species on 
Haan Island in the Ba This range of dates, March 22, 
I, November 28, would seem to indicate that there is 
nothing oy seasonal in the production of spores in Hali- 
meda tridens and that the remarkable rarity with which fertile 
ag 
s 
erved a similar periodicity in the same species on 
the coast of North Carolina, but finds the periods separated by 
monthly instead of fortnightly intervals. Whether the develop- 
where these collections were made have a range of only about 
three decimeters, and, furthermore, the periodicity in Dictyota 
has been observed in the development of the sexual cells only, 
* Bull. Torrey Club 34: 493. 1907. 
