CATALOGUE OF PLANTS. 



127 



PLECTONEMA, Thuret. 

 P. tenue, Thuret. 

 M, Spot Pond. 



SYMPLOCA, Kuetz. 

 5. muralls, Kuetz. 



M, forming minute green plush-like patches on ground, near 

 Black Rock. 



LYNQBYA, Ag. 

 L. ochracea, Thuret. 



M, Cascade : — B B, 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. 



QSCILLATORIA, Vauch. 



O. amcena (Kuetz.), Gomont. 

 B B, on rocks and trunks of trees. 



O. amphibia, Ag. 



BB, with the preceding species. 



O. tenuis, Ag. 



B B, with the preceding species. 



O. terebriformis, Ag. 



BB, with the preceding species. 



CALOTHRIX, Ag. 

 C. fusca (Kuetz.), Born. & Flah. 

 M, among various gelatinous algae on rocks at Cascade. 



C. parietina (Naeg.), Thuret. 



M, forming minute tufts on rocks near Bear's Den. 



