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different that we feel safe in describing it under the foregoing 
name. Belt River in the cafion and in other streams of the Belt 
mountains and main range of the Rockies, from 5,000 to 8,000 feet 
altitude. June to September. See Wolle’s Fresh-Water Algz of 
the United States, p. 339. 
T. GIGANTEA var. SOLIDA, Anders. and Kelsey n. var. 
Thallus firmly attached by a broad or rarely narrowed base, 
usually tapering from the base to the blunt point; firm, solid 
throughout, or hollow only below, pliable and slightly elastic, 
can be cut in slices with a penknife, and can be carried in the 
hand and trailed along the ground like a quirt; usually covered 
outside with silica or possibly fine sand; glaucus outside, dark 
green inside and paler towards the centre, where the cells are not 
so crowded ; one to six feet long, with a diameter of one inch or 
less at the base. 
This remarkable alga invariably grows on flat bed rock in the 
“dead water” just below the ripples, and near the edge of the 
stream. Like the species, may be found from June to Septem- 
ber; Belt River, in the cafion, Belt Mountains. 
Tetraspora cylindrica, Ag. Occasionally found in rills from 
slow-flowing springs. Slender, attenuate pointed, six inches to a 
foot long, bright green, slippery ; often attached to dead sub- 
merged twigs. July to October. 5 
Tetraspora lubrica, Ag. Very common in quiet springs and 
slow streams throughout the State. A quite variable species. 
June to October. : 
Spirogyra quinina (Ag.), Kg. Common everywhere in a 
vegetative condition, all the year round. We have neither 
caught it in conjugation nor in fruit as yet. 
Zygnema insigne, Kg. Common in stagnant and slow waters. 
Abundantly conjugating and fruiting in September, when it is 
floating in dirty, yellowish, frothy masses. 
Zygnema peliosporium. Common on dripping rocks and on 
the margins of cold, shaded springs. Fruits abundantly in No- 
vember. A beautiful species. 
Gleotrichia pisum, Thur. Common in Sand Coulee Creek 
on the leaflets of Myriophyllum spicatum, L. Doubtless occurs 
throughout the State. August to October. 
