102 Rhodora [JUNE 
laboratory cultures, the most and least favorable circumstances attend- 
ing their growth and reproduction, some rule may perhaps be deduced, 
some combination of temperature and nutrient solution, that will make 
it possible at least to predict the appearance of objectionable forms. 
Arrangements could then be made for shutting out that particular part 
of the supply and preventing the contamination of all the water. 
EXCURSIONS. OF THE JOSSELYN SOCIETY. 
M. L. FERNALD. 
DuniNG the field-excursions of the Josselyn Botanical Society of 
Maine, at the annual meeting in Waterville, August 30 to September 2, 
many phanerogams of unusual interest were collected in Waterville, 
Winslow, and Belgrade. Three plants not before detected in the state 
were found: Rhynchospora capillacea, Torr., var. Jeviseta, Hill, in 
crevices of wet calcareous ledges by the Kennebec, Winslow; Carex 
granularis, Muhl., var. /Zaleana, Porter, common on ledgy shores of 
the Kennebec ; and Eupatorium purpureum, L., var. amoenum, Gray, 
scarce, by the Kennebec, Waterville; the two former not previously 
known in New England. ‘Two more species, not yet satisfactorily de- 
termined, may be new to the state. Two other plants, not before listed 
from Maine, though formerly collected at other stations in the state, 
are Cyperus aristatus, Rottb., abundant on sandy and gravelly banks 
of the Sebasticook at * Beulah,” Winslow; and Circaea intermedia, 
Ehrh., in river thickets along the Kennebec, Winslow. This interest- 
ing Circaea, which in central Maine seems to replace the more southern 
C. Lutetiana, is a common European type, but it has never been re- 
corded in America. The species occurs also in Piscataquis and Penob- 
scot counties, the earliest collection having been made by the 
Rev. A. P. Chute, in 1847, near Hunt's, on the east branch of the 
Penobscot. 
Some specially noteworthy plants, not before recorded from the 
Kennebec valley, were Woodwardia virginica, Smith, abundant in a 
bog, Belgrade ; Juncus alpinus, Vill., var. insignis, Fries, in crevices of 
calcareous ledges by the Kennebec, Winslow; Quercus macrocarpa, 
Michx., abundant about “Beulah,” also a single tree by the river, Water- 
ville (formerly reported by Prof. E. W. Hall) ; Aster novae-angliae, L., 
