248 FLORA OF MOUNT DESERT. 



L. semi-plena (Ag.), J. Ag. 



Filaments .006-.012 mm. diam., sheath usually thin and deli- 

 cate; articulations ^-J as long as broad; color of stratum dark 

 green to olive-yellow. Not common. Shore near Seal Harbor 

 (Collins). 



L. lutea, Gomont. L. tenerrima, Farlow's Manual, 35. 

 Near outlet of Long Pond, among Calothrix, etc. (Collins). 



PHORMIDIUM, Kuetz. 



Similar to Oscillatoria, but the filaments are included in a 

 general mucilaginous layer. 



P. fragile, Gomont. 



Trichomes bright green, somewhat flexuous, moniliform, at- 

 tenuate at the apex, cells subquadrate, .0012-. 0023 mm. diam. 

 Forming a dull green gelatinous stratum on woodwork. Near 

 Seal Harbor (Collins). 



OSCILLATORIA, Vauch. 



0. subuliformis, Kuetz.? 



On rocks near Seal Harbor (Collins). A plant agreeing with 

 the description of Oscillaria subidiformis, Harv., in Farlow's 

 Manual, 33. According to Gomont, it is doubtful if Harvey's 

 plant is the same as Kuetzing's, so that all that can be said in 

 this case is that the plant agrees with Farlow's description. 



* 0. limosa, Ag. 



In fresh water (Holden). 



* 0. amphibia, Ag. 



In fresh water (Holden). 



SPIRULINA, Turpin. 



S. subsalsa, Oersted. S. tenuissiina, Farlow's Manual, 31. 

 On rocks on shore near Seal Harbor (Collins). 



