166 
Vaucheria piloboloides, Thuret. 
‘‘Undoubtedly in Essex county. It is very abundant in the salt 
marshes at Malden. There are other Vaucheriz along the shore, 
but I do not think the species are definitely settled” (Frank S. 
Collins, in letter Nov. 24, 1879). 
ZOOSPORE 42. 
Enteromorpha intestinalis, Link. 
Very common. 
Enteromorpha compressa, Grev. 
Very common. 
Enteromorpha clathrata, Grev. 
Frequent. 
Ulva latissima, Zinn. (SEA-LETTUCE; SEA-CABBAGE.) 
Very common. This, and sometimes the next, are the plants 
which so abound in brackish waters along our coast. When 
decaying in large quantities, the Beggiatoz* upon them produce the 
well known disagreeable smell so familiar to those residing near 
tide ponds and flats. This may be given as V. lactuca in future 
works. 
Ulva lactuca, Linn. (Monostroma Grevillei, Le Jolis). 
Common. Marblehead (Frank S. Collins), Gloucester (Mrs. Bray), 
etc. 
Cladophora rupestris, Zinn. 
Common. 
Cladophora arcta, Dillw. 
Quite frequent. 
Cladophora lanosa, Joth. 
Nahant (Frank S. Collins, Dr. Farlow), also noticed by Mrs. Bray. 
Cladophora uncialis, Fl. Dan. 
Occasional (Rev. A. B. Hervey, Frank S. Collins). 
Cladophora glaucescens, Grif. 
Nahant (Frank S. Collins), also noticed at Magnolia by Mrs. Bray. 
A more southern species. 
Cladophora flexuosa, Grif. 
Nahant (Frank S. Collins), etc. Occasional. 
Cladophora refracta, Roth. 
Marblehead (Frank 8S. Collins, Rev. A. B. Hervey), Gloucester 
(Mrs. Bray). Southern. 
Cladophora albida, Huds. 
Gloucester (Mrs. Bray). Southern. 
4A low parasitic alga (see Farlow, Bull. Bussey Inst., Jan., 1877, p. 76). 

