1924] Lewis,—Flora of Penikese 215 
*Phyllophora membranifolia (Good. et Woodw.) J. Ag. 
Plumaria elegans (Bonnem.) Schmitz. 
Polysiphonia elongata (Huds.) Harv. 
Polysiphonia fastigiata (Roth) Grev. 
*Polysiphonia fibrillosa (Dillw.) Grev. 
Polysiphonia nigrescens (Dillw.) Grev. 
*Polysiphonia nigrescens var. Durkeei Harv. 
*Polysiphonia nigrescens var. fucoides Harv. 
Polysiphonia urceolata (Dillw.) Grev. var. formosa (Suhr.) Ag. 
*Polysiphonia urceolata var. patens (Dillw.) Grev. 
Polysiphonia violacea (Roth) Grev. 
*Polysiphonia violacea var. flexicaulis Harv. 
Porphyra laciniata (Lightf.) Ag. 
*Rhododermis Georgii (Batters) Collins. 
Rhodomela subfusca (Woodw.) Ag. 
Rhodymenia palmata (L.) Grev. 
Seirospora Griffithsiana Harv. 
Spermothamnion Turneri (Mart.) Aresch. 
Spyridia filamentosa (Wulf.) Harv. 
B. Atcar or Brackish WATER (nv Tracy E. Hazen). 
Arthrospira Gomontiana Setchell. 
Chlorella vulgaris Beyer. 
Enteromorpha intestinalis (L.) Link. 
Lyngbya aestuarii (Mert.) Liebm. 
Oscillatoria amphibia Ag. 
Oscillatoria margaritifera (Kuetz.) Gom. 
Oscillatoria subuliformis (Thw.) Gom. 
Oscillatoria sp. 
Spirulina tenuissima Kuetz. 
\ 
(In addition to the algae listed, certain alga-like bacteria are 
common in the brackish ponds, such as Beggiatoa mirabilis, Beggiatoa 
alba marina, and Lamprocystis roseo-persicina.) 
C. Diarows (BY PAUL S. Concer). 
Achnanthes longipes Ag. 
Actinocyclus crassus W. S. 
Actinocyclus Ehrenbergii Ralfs. 
Actinoptychus undulatus E. 
