154 MIDDLESEX FLORA. 



OOSPOREv^E. 



Fucus, L. 



F. vesiculosus, L. BLADDERWRACK. 

 Very common everywhere in salt water. 



ASCOPHYLLUM, Stack. 



A. nodosum, Stack. 



With the preceding, and equally common. 



VAUCHERIA, DC. 



V. Dillwynii, Grev. 



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

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



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

 V. terrestris, Lyng. 



Maiden, fresh water. 

 V. uncinata, Kuetz. 



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

 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 different species of Vaucheria 



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



we have other marine or submarine species. 



BULBOCH^ETE, Ag. 



B. rectangularis, Wittr. 

 Medford, fresh water brook. 



PH>OSPORE>E. 



PUNCTARIA, Grev. 



P. latifolia, Grev. 



Medford, ditches in salt marsh. 

 P. latifolia, Grev., var. Zosterae, LeJolis. 



With the type. 



PHYLLITIS, LeJolis. 

 P. fascia, Kuetz. 



Mystic river and salt marshes. 



