34 Rhodora [ FEBRUARY 
and the Public Garden pond has a very muddy bottom. The luxuriant 
growth may be partly due to this. Yet the fact that the species 
appeared so regularly and abundantly after the reservoirs had been 
emptied would seem to indicate that the drying out of the soil con- 
stituents of the pond acted as a stimulus to the germination of the 
spores, which were dormant in the soil. In all of the localities named, 
this alga was more or less abundant during the second year after the 
ponds were emptied, although in other years, as already remarked, it 
was rare or absent. 
The ponds being unconnected, the plant could not have originated 
in one and spread to the others; and the difference in dates excludes 
general climatic conditions from producing the results. 
S. crassa is here taken in the sense in which it is used by Wolle 
(Fresh Water Algae of the United States). The form found in Massa- 
chusetts appears to be fairly distinct, but there may be some doubt in 
referring it to any particular European form. 
COREOPSIS INVOLUCRATA ON THE ATLANTIC COAST. — Permit me to 
mention in the columns of RHODORA a plant which seems a good way 
from home. Several years since, Miss Sarah Fell, an enthusiastic bota- 
nist of this city, discovered in the reclaimed tide-water marshes at the 
junction of Christiana Creek with Delaware River, the southwestern 
Coreopsis involucrata of Nuttall. It was again found in great profu- 
sion this year by Mr. Commons, and later by myself, growing along a 
“marsh road." It is a fine species, not very unlike C. Zrzckosperma, 
Michx., which is also common here. — WM. M. Cansy, Wilmington, 
Delaware. 
[The closely related C. aristosa, Michx., has been twice collected on wool waste 
in New England: by C. W. Swan at Dracut, Mass., in 1894, and by 7. C. Parlin and 
M. L. Fernald at North Berwick, Me., in 1897. C. involucrata may be expected in 
such places. — Ep. ] . : 
THE DISTRIBUTION OF CERTAIN TREES AND SHRUBS 
IN WESTERN CONNECTICUT. 
CHARLES K. AVERILL. 
THE following notes on the distribution of certain trees and shrubs 
in the Housatonic River region of western Connecticut may be of 
