1907] Wheeler,— New Stations for two Vermont Plants 227 
New STATIONS ror Two Vermont PrANTS.— This season I found 
beside the road, near the long bridge across West River, about a 
mile above Townshend village, a plant which proved to be Berteroa 
incana, DC. It was growing in considerable abundance in a light 
sandy field. 
Up to the time of the publication of the Brainerd, Jones, and Eggle- 
ston's Flora of Vermont this plant had been reported from but three 
stations in the state. 
I have found Sisymbrium altissimum, L. in two places in Jamaica 
this season: one in our strawberry field and again in a neighbor's 
door-yard. Mr. Dobbin of Shushan, New York, while in town this 
year, found it beside the railroad above Jamaica depot. ‘This also 
seems to be one of the infrequent but increasing Vermont plants.— 
Leston A. WHEELER, Jamaica, Vermont. 
NEW ENGLAND SPECIES OF PENIUM. 
JOSEPH A. CUSHMAN. 
Species of the genus Peniwm cannot be called common in New 
England although specimens are usually met with in nearly all gather- 
ings of Desmids of any richness. Many of the species are inconspic- 
uous and a few of them minute. Twenty-eight species are known 
from the British Isles while but twelve are recorded here from New 
England. Two of these are recorded here for the first time. ‘The 
forms which have not been previously recorded are preceded by an 
asterisk. All records for which specimens have been seen are followed 
by an exclamation point. A brief synonymy is given to clear up 
some of the names used in American works and to give references 
to published figures. A key is given to the species recorded here, 
based upon that of the Wests. Measurements and descriptions 
unless otherwise stated are based upon New England specimens. 
PENIUM Bréb., 1844. 
Cells straight, usually cylindrical or fusiform, with or without a 
slight median constriction; each semicell with a single axile chloro- 
