BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 



797 



Division THALLOPHYTA. 



Subdivision ALGAE. 

 CLASS CYANOPHYCE^. 



Order COCCOGONALES. 



Family CHROOCOCCACE^. 



Chroococcus turgidus Nageli. 



Common, in salt marshes, on wet earth and rocks, 



mixed with Calothrix, Lyngbya, Microcoleus, 



Vaucheria, etc. 

 Woods Hole: Little Harbor, Penzance. Quisset 



salt marshes. Hadley Harbor. 

 Spring, summer, undoubtedly at other seasons. 



Gloeocapsa crepidinum Thuret. 



Abundant, on woodwork and rocks at high-water 



mark. 



Woods Hole. 

 At all seasons. 



Polycystis elabens Kiitzing. 



Common, in salt marshes, forming slimy masses 

 on decaying algae and on Zostera, frequently 

 mixed with Lyngbya, Microcoleus, etc. 



Woods Hole: Penzance. Quisset. Hadley Har- 

 bor. 



Summer. 



Farlow, 1881, p. 28 (Polycystis elabens Kiitzing), 

 Woods Hole. 



Family 



Dermocarpa prasina (Reinsch) Bornet & Thuret. 

 Common, on Polysiphonia fastigiata. 

 Woods Hole, off Juniper Point. 

 Spring, early summer. 



On Polysiphonia fastigiata, which in turn grows 

 on Ascophyllum nodosum. 



Hyclla ceespitosa Bornet & Flahault. 



Abundant wherever old shells are found in quiet 



waters. 

 Woods Hole. 



Spring, summer, undoubtedly at all seasons. 

 Boring into clam and other shells. 



Pleurocapsafuliginosa Hauck. 



Common, on harbor walls and rocks near high- 

 water mark, forming a dark stain. 

 Woods Hole. 

 At all seasons. 



Order HORMOGONALES. 

 SUBORDER HOMOCYSTE^. 



Family OSCILLATORIACE^E. 



SUBFAMILY VAGINARlE^. 



Hydrocokum glutinosum (Agardh) Gomont. 

 Common, on Zostera. 

 Woods Hole. 

 Summer. 



Farlow, 1881, p. 35, 36 (Lyngbya nigrescens var. 

 major Farlow), Woods Hole; A. A. B. Ex., fas. 

 i, no. 47 (Lyngbya nigrescens var. major Far- 

 low), Woods Hole (W. G. Farlow). 



Hydrocoleum lyngbyaceum Kiitzing. 

 Occasional, on Ascophyllum nodosum. 

 Harbor of Woods Hole. 

 Summer. 



P. B.-A., fas. V, no. 204 (Hydrocoleum lyngbyace- 

 um var. A, Gomont), Woods Hole, August 14, 

 1894 (W. A. Setchell). 



Microcoleus chthonoplostes (Flora Danica) Thuret. 

 Common, in salt marshes and brackish pools, 



mixed with Lyngbya and other algae. 

 Woods Hole: Eel Pond, Penzance. Quisset. 



Hadley Harbor. 



Summer, undoubtedly at other seasons. 

 Farlow, 1881, p. 33, 34 (Microcoleus chthono- 



plastes Thuret), Woods Hole; Farlow, 1881, p. 



33 (Oscillaria subtorulosa Brebisson), Woods 



Hole; A. A. B. Ex., fas. v,no. 227, Woods Hole, 



August, 1877 (W. G. Farlow); P. B.-A., fas. 



iv, no. 153, Woods Hole, July 17, 1895 (W. J. V. 



Osterhout). 



Microcoleus tenerrimus Crouan. 



Occasional, in salt marshes and brackish pools, 

 mixed with Microcoleus chthono plastes , Lyng- 

 bya, and other algae. 



Woods Hole: Penzance, Eel Pond. 



Summer. 



Found by F. S. Collins, summer of 1904. 



