1903] Cushman,— Notes on New England Desmids,—— I 221 
NOTES ON NEW ENGLAND DESMIDS, — I. 
JosEpH A. CUSHMAN, 
IN a series of short papers the writer wishes to add to the records 
of the forms and distribution of the Desmids of our New England 
flora. New England forms have not been extensively reported with 
the exception of the lists given at the end of the present paper, 
the localities given by Wolle are about all we have to depend upon 
for the distribution. The records of Wolle while in many points 
inaccurate, are nevertheless the type of work which with greater care 
should sometime be done for New England. It is in the spirit of 
adding. to that work that the present series is attempted. The 
measurements in many cases are more full than given by Wolle. 
The variety of forms noted from one pond in Bridgewater, Mass. 
(Ruopora, March 1903) shows what may be found in any of our 
numerous New England ponds. In these papers the writer hopes to 
record the species from as many stations in New England as possi- 
ble. If the readers of RuopoRA would send small amounts of 
material to be examined it would help the work and be thankfully 
received. 
The following species were identified in a small collection from 
Steep Brook, Massachusetts, about three miles north of Fall River 
Railway Station. They were collected in a swamp brook on March 
28, 1903, by the writer. Staurastrum-was especially well represented. 
Euastrum elegans Kg. This species appears to be common here 
as elsewhere, the specimens obtained differing considerably in this 
collection. One form is somewhat different from any of Wolle's fig- 
ures of this species, having the end lobe more square, the angles 
between it and the lateral lobes almost 9o degrees and the lateral 
lobes divided into two well separated lobules, more distinct than in 
any of the figures. This was a large form measuring ; diam. 35 p, 
length 50—55 p, thickness through inflation 12 a. Of this species 
another smaller form, which is more common, measures: length 22 p, 
diam. 18 u, being about half the size of the first. 
Cosmarium undulatum Corda, var. crenulatum Wolle. Wolle does 
not give the measurements of his variety but the specimen corre- 
sponds well with his description. Length 28-30. Diam. 25 p. 
Isthmus 8 y. 
