PLANTS OF ERODE ISLAND. 115 



MICROCOLEUS, Desm. et Thmet. 



1. terrestris, Desm. Common. 



2. anguiformis, Ilarv. Geneva. 



3. hyalinus, (Kg.) Kirch. Davisville. 



OSCILLARIA, Bosc. 



1. subtilissima, Kg. Common. 



2. detersa, Stiz. Roger Williams Park. 



3. antliaria, Juerg. Common. 



4. leptotrichia, Kg. Providence. 



5. violacea, Wallr. Common. 



6. tenuis, Ag. Providence, Mr. Lathrop. 



7. nigra, Vanch. Common, 



8. princeps, Vauch. Common. 



LEPTOTHRIX, Kg. 



1. tenax, Wolle. Common. 



2. csespitosa, Kg. Common. 



3. rigidula. Kg. Spectacle Pond. 



4. bullosa, Wolle. Quidnessett. 



5. ochracea. Kg. Very common. 



ASTEROTHRIX, Kg. 

 Creginii, Wolle. (?) Pocasset. 



(This plant accords with Mr. Wolle' s description and figure, but 

 had not the least tinge of color.) 



SPIRULINA, Lk. 

 Jenneri, Kg. Quidnessett, rare. 



Chroococcaceoe. 

 MBRISMOPEDIA, Meyen. 



1. glauca, Naegr. Common; Providence, Mr. Lathrop. 



2. convoluta, Breb. Common. 



C^LOSPHERIUM, Xaegr. 

 Kuetzingianum, Xaegr. Common; Providence, Mr. 

 Lathrop. 



CLATHROCYSTIS, Henfr. 

 aeruginosa, Henfr. Common, at times abundant. 



GOMPHOSPH^RIA, Kg. 

 aponina, Kg. Providence, &c. 



APHANOCAPSA. Naegr. 

 Grevillei, (Hass.) Rab. Benedict and other ponds. 



