412 SAUNDERS 



Enteromorpha crinita (Roth) J. Ag. 



Wrangell (65); Sitka (155); Prince William Sound (309). 



Frond abundantly branched, usually with a main stem and virgate 

 branches, with cells in longitudinal series, beset with short, tapering 

 ramuli, the smallest of a single series of very short cells. 



In specimens from this last locality the habit is that of E. intes- 

 tinalis forma cylindracea^ but the structure and the branching are 

 those of E. crinita. 



Family UL O THRICHA CE^E. 



Ulothrix flacca (Dillw.) Thuret. 



Glacier Bay (82). Very abundant, forming a dark green coating 

 on rocks and pebbles on the shore, extending up to within a quarter 

 of a mile of the glacier. 



Cells one-sixth to two-thirds as long as broad ; filaments 20-40 11 in 

 diameter. 



Hormidium parietinum (Vauch.) Kuetz. 



Yakutat Bay ; St. Paul, Kadiak. 



Cells one-fourth to one diameter in length, often dividing into two or 

 more lateral series, which may develop into a flat membrane. 



As now understood, U. parietinum includes two forms that were 

 long considered distinct species, and that in their fully developed con- 

 dition are of quite different habit, — the filiform Ulothrix parietina 

 and the membranaceous Prasiola crispa. In the specimens collected 

 at Yakutat both forms are to be found, each apparently usually occur- 

 ring by itself, but both sometimes together. The frond of the Pra- 

 siola may reach several millimeters in width. The species occurs on 

 damp ground, not like most other algae, submerged. 



Family (EDOGONIACE^E? 



Oedogonium concatenatum (Ilass.) Wittr. 



Popof Island. 



This species was reported by Wolle from Pennsylvania and New 

 Jersey ; I have also observed it in material from Maiden, Mass. 



Bulbochaete brebissonii Kuetz. 



In a freshwater pond near Seldovia, Cook Inlet. 



This species has not been hitherto known to occur in America. 

 The form reported by Wolle does not belong to this species. 



'This family -was determined by Dr. K. E. Him, of The Rojal University of 

 Finland, whose notes are here given in translation. 



