brown University 
DEPARTMENT OF BOTANY 
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Cfear: Professor Collins:- 
You ane quits right about 15165j-.it is Rio- 
s» 
c!i'a fluitans. I would like to kiipw the exact 
data about *i*he specimen, i„n case you come across 
them. 15142, from Nevf Hampshire', I would refer 
to Ptilidium oiliare, and 15151. also from New 
Hampshire, to P. pulcherrimum. 
I shall be very glad to see the Gaspe hepat- 
ios. Mr. Chamberlain told me something about 
them when I saw him at the Sullivant meeting. 
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