154 MIDDLESEX FLOEA. 



OOSPOREyE. 



Fucus, L. 



F. vesiculosus, L. Bladdebwrack. 

 Very commoa everywhere in salt water. 



AscoPHTLLUM, Stack. 



A. nodosum. Stack. 



With the preceding, and equally common. 



Vaucheeia, DC. 



V. Dillwynii, Grev. 

 Newton, fresh water (W. G. Parlow). 



V. geminata, DC, var. racemosa, Walz. 

 Maiden, Medford, and Melrose, rather common in fresh water. 



V. terrestris, Dyng. 

 Maiden, fresh water. 



V. uncinata, Kuetz. 

 Newton, fresh water (W. G. Parlow) . 



V. Thuretii, Woronin. 

 Ditches in salt marshes, common. 



V. litorea, Nordst. 

 With the preceding, but not so common, and preferring salt rather 

 than brackish localities. The sexual fruit is rarely found in these 

 two species, and as sterile plants of the difierent species of Vaucheria 

 are hardly distinguishable from each other, it is not impossible that 

 we have other marine or submarine species. , 



BULBOCaffiTE, Ag. 



B. rectangularis, Wittr. 

 Medford, fresh water brook. 



PHyCOSPOREy^. 



PuNCTAEiA, Grev. 



p. latifolia, Grev. 



Medford, ditches in salt marsh. 

 P, latifolia, Grev., var. Zosterse, Le Jolis. 



With the type. 



Phyllitis, LeJolis. 

 P. fascia, Kuetz. 



Mystic river and salt marshes. 



