176 SAUNDERS [412] 



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 JE. intes- 

 t mails forma cylindracea, but the structure and the branching are 

 those of JE. crinita. 



Family ULOTHRICHACE^^. 



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 /z 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, H. farietinum 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 CEDOGONIACE^^} 



Oedogonium concatenatum (Hass.) 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. 



iThis family was determined by Dr. K. E. Him, of The Royal University of 

 Finland, whose notes are here given in translation. 



