130 METROPOLITAN PARK FLORA. 
M, swamp near Bear’s Den, fruiting plentifully in June, 
1893. 
M. nummuloides, Hass. 
M, swamp near Bear’s Den. 
M. scalaris, Hass. 
M, swamp near Elm St., Medford. 
M. quadrangulata, Hass. 
M, swamp near Bear’s Den. 
CHLOROPHYCE©. 
VOLVOX, Ehren. 
V. globator, Ebren. 
M, Shiner Pool. 
TETRASPORA, Ag. 
M, very common in spring in running water. 
OPHIOCYTIUM, Naeg. 
O. parvulum (Perty), A. Br. 
M, sparsely distributed among various algz. 
PEDIASTRUM, Meyer. 
P. Boryanum (Turp.), Menegh. 
M, among various algz, Hemlock Pool. 
ULOTHRIX, Kuetz. 
U. zonata (Web. & Mohr), Kuetz. 
M, Spot Pond brook in spring. Other species of Ulothriz, 
also species of Conferva, are common in the Fells, but specific 
determinations are uncertain. 
CHAETOPHORA, Schrank. - 
C. Cornu-Damz (Roth), Ag. 
M, common. 

