
CATALOGUE OF PLANTS. 127 
PLECTONEMA, Thuret. 
P. tenue, Thuret. 
M, Spot Pond. 
SYMPLOCA, Kuetz. 
S. muralis, Kuetz. 
M, forming minute green plush-like patches on ground, near 
Black Rock. 
; LYNGBYA, Ag. 
L. ochracea, Thuret. 
M, Cascade: — BB, on rocks in stream. Probably every- 
where common. 
PHORMIDIUM, Kuetz. 
P. Corium (Ag.), Gomont. 
M, on cliff. 
P. uncinatum, Gomont. 
M, running brook near Elm St., Medford. 
OSCILLATORIA, Vauch. 
O. ameena (Kuetz.), Gomont. 
B B, on rocks and trunks of trees. 
O. amphibia, Ag. 
B B, with the preceding species. 
O. tenuis, Ag. 
B B, with the preceding species. 
O. terebriformis, Ag. 
BB, with the preceding species. 
CALOTHRIKX, Ag. 
C. fusca (Kuetz.), Born. & Flah. 
M, among various gelatinous algz on rocks at Cascade. 
C. parietina (Naeg.), Thuret. 
M, forming minute tufts on rocks near Bear’s Den. 
