[397] 



THE ALG^ l6l 



Schizothrix lacustris A. Braun. 



In a freshwater pool with Stigonema near Prince William Sound 

 (300). Identified by Setchell. 



Microcoleus vaginatus (Vaucher) Gomont. 



Forming, with Scytonema mirahilis^ a thin coating on damp ground 

 recently covered by snow. Glacier Bay (104). 

 / 



Family NOSTO CA CE^^. 



Nostoc commune Vaucher. 



Forming thin leathery thalH of indefinite size and shape on damp 

 ground near Glacier Bay (106) ; Hidden Glacier, Yakutat Bay (502). 



Cells spherical or oblong, 12-18 11 in diameter; often two to four 

 cells coalesced. Tegument colorless ; cytoplasm finely granulated. 



Aphanothece microspora Naegeli. 



Forming with Chroococcus turgidus a slimy coating on a perpendic- 

 ular cliff over which water was trickling. Juneau (75). 



Microcystis marginata Naegeli. 



Forming a slimy coating on a perpendicular cliff near Juneau (75). 



Dermocarpa prasina Born. & Thur. 



Abundant on Sphacelaria racemosa arctica and Sphacelaria cir- 

 rosa. From Puget Sound to the Shumagin Islands. 



Dermocarpa fucicola sp. nov. (Plate xlvi, figs. 4 and 5.) 

 Phycotheca Boreali-Americana, No. 801. 



Plant forming dark violet brown patches 2-12 mm. in extent; cells 

 40-60 {J. high, 18-25 /t broad, ovate, clavate or spatulate, much nar- 

 rowed below ; schizospores abundant. On Fucus evanescens mega- 

 cephala^ Puget Sound (440). Forming orbicular or irregular patches 

 which become confluent into irregular masses of indefinite extent. 



This plant is closely related to Savageau's D. biscayensis^ but dif- 

 fers from it in the larger size of the patches and the shape and size of 

 the individual cells. In D. biscayensis the plant forms orbicular 

 patches i mm. broad and the cells are 25-30 /x broad. 



Family OSCILLATORIACE^^. 

 Oscillatoria amoena (Kuetz.) Gomont. 



The plant formed a soft, felt like, dark bluish-green mass 3-10 mm. 

 thick, of indefinite extent, lining the bottom of the outlet of a hot 

 spring. The water in the outlet where the plant was abundant ranged 

 from So** F. some distance from the spring to 120° F. near the spring. 

 Near Sitka (158). Identified by Gomont. 



