Prof. Bailey on the Alg@ of the United States. 401 
Rivularia atra, Roth. Rocky sea shores, Rhode Island. 
Rocks near low water, in the Hudson River, at West Point. — 
Rivularia angulosa, Roth. Common on leaves of Vallisneria 
in the Hudson River. Occurs also in Rhode Island, and in the 
Fourth Lake, Ouisconsin. 
Stigonema atrovirens, Ag. Moist rocks at Indian Falls, Put- 
nam Co., N. Y. 
Stigonema mammilosum, Ag. Abundant in Round Pond, 
near West Point, covering submerged rocks, &c. 
Scytonema ocellatum, Harv. Warden’s Pond, R. I. Abun- 
dant at Niagara Falls, on rocks wet with spray. 
Scytonema contertum, Carm. Foot of Crow’s Nest, West 
oint. 
Tolypothriz distorta, Kitz. Warden’s Pond, R.I. Reservoir 
Pond, West Point. Fourth Lake, near Madison, Ouisconsin. 
Calothrix confervicola, Ag. Very abundant on marine Alge 
every where in Narragansett Bay, R. L. 
Calothrix scopulorum, Ag. Rocks at Newport and Seaconnet, 
__ Oscillatoria. The species of this genus are very difficult to 
identify by the descriptions, and it is even stated by Mayen, that 
mal cies undergo manifold changes during their growth. It 
is therefore with much hesitation that I present the following 
names. 
Oscillatoria tenuissima, Ag. Warm Springs of Washita, Dr. 
James! v. sp. in herb. Tor. ide 
Oscillatoria tenuis, Ag. Providence, R. I. West Point, N. 
- Culpepper Co., Va. 
Oscillatoria decorticans, Grev. On pumps, &c. Common 
every where. 
Oscillatoria muscorum, Ag. On mosses in the ravine on the 
Crow’s Nest, West Point. 
cillatoria nigra, Vauch. Common at West Point, N. Y. 
Oscillatoria Corium, Ag. Mill dams near West Point. ; 
All our species of Oscillatoria have a strong and peculiar 
swamp-like odor, which I have not seen alluded to by writers. 
Their extraordinary oscillations and radiations, so wel 
by Carmichael, (See Hooker's Brit. Flor., Vol. v, p. 372,) I have 
en witnessed, and I feel satisfied that it is impossible to ac- 
count for these motions by evolutions of gases, currents in the 
liquid, elasticity of filaments, and other mechanical causes, which 
: ve been suggested by some writers in explanation of the phe- 
omena, 
Microcoleus repens, Harv. Common in damp earth. West 
Point, N.Y. Providence, R. I. Hingham, Mass., Rev. J. L. 
Russell ! 
Seconp Series, Vol. III, No. 9.—May, 1847. 51 
