1924] Lewis,—Flora of Penikese 211 
FLORA OF PENIKESE, FIFTY YEARS AFTER. 
Edited by I. F. Lewis. 
(Continued from page 196.) 
LIST OF SPECIES. 
ALGAE. 
A. ALGAE or FRESH WATER (BY Tracy E. Hazen). 
M yxophyceae 
Anabaena oscillarioides Bory, var. stenospora Born. et Flah. 
Calothrix epiphytica W. et G. S. West. 
Cylindrospermum majus Kuetz. 
Microcystis sp. 
Nodularia paludosa Wolle. 
Nostoc sp. 
Oscillatoria splendida Grev. 
Oscillatoria tenuis Ag. 
Oscillatoria sp. 
Phormidium tenue (Menegh.) Gom. 
H cterokontae 
Botryococcus Braunii Kuetz. 
Tribonema bombycinum (Ag.) Derb. et Sol. 
Tribonema utriculosum (Kuetz.) Hazen. 
Chlorophyceae 
Ankistrodesmus falcatus Ralfs. 
Asterococcus limneticus G. M. Smith. 
Botrydium granulatum Grev. 
Bulbochaete sp. (sterile). 
Characium ambiguum Herm. 
Chlamydomonas (three undetermined species). 
Chlorella vulgaris Beyer. 
Closterium Ehrenbergii Menegh. 
Closterium sp. 
Cosmarium (two species). 
Elakatothrix gelatinosa Wille. 
