ADDENDA. 339 



TETRASPORA OYLINDRICA, Ag. See p. 190. 



Sometimes attains extraordinary dimensions. F. \\ r . 

 Anderson reports it from Montana as forming- in a mountain 

 torrent (Belt River), long jelly-like fronds, very slippery 

 and easily ruptured ; length varies from one to ten feet ; 

 diameter from a slender thread to an inch or more wide; 

 bright green. In connection with this plant-form, Mr. 

 Anderson relates the following: 



There is a species of garter snake peculiar to the moun- 

 tains, that just gorges itself upon this plant; grasping with 

 its extended jaws an end of a long tube it draws it in little 

 by little until perfectly full, then most amusingly it will 

 shake it as a little terrier will shake a rat. These snakes are 

 seldom over two feet long ; to see them tussling with a long 

 slippery alga many times longer than themselves, in the 

 swift current, is quite ludicrous. 



CLADOPHORA CALLICOMA, Kg. 



Filaments much, and often fasciculately branched, ordi- 

 narily 8-16 cm long, bright yellowish green; cells cylin- 

 drical, six to sixteen times longer than thick ; membrane 

 rather thin ; cytioplasm somewhat loose, irregularly spir- 

 ally arranged. Spore-bearing cells usually only one-half a-S 

 long as the sterile cells. 



Diameter of stems, 50-70 /* ; branchlets, 22-25 ^. 



From rapid waters mountain stream, 40(10 to 5000 feet 

 elevation, Montana. Collected by F. W. Anderson, who 

 reports it forming, and growing in long ropes 3-10 feet long, 

 undulating in the flowing water and beautifully waving its 

 lateral branches. 



