606 GEOLOGICAL SURVEY OF NEW JERSEY. 
HAPALOSIPHON, Neg. 
H. Braunii, Kiitz. 
Atlantic: In ponds, on submerged plants, Atsion and Ham-- 
monton. 
H. Brebissonii, Kiitz. 
In similar situations; frequent. 
H. fuscescens, Kiitz. 
Frequent in ponds. 
H. tenuissimus, Grun. 
Ponds and wet ground ; frequent. 
NOSTOCE. 
NOSTOC, Vauch. 
(A fresh-water genus.) 
N. comminutum, Kiitz. 
On pond-waters ; frequent. 
N. commune, Vauch. 
On wet ground ; common. 
N. sphericum, Vauch. 
On wet rocks ; abundant. 
N. rupestre, Kiitz. 
On moist rocks; frequent. 
N. cwruleum, Lyngb. 
In ponds and on dripping rocks. 
N. pruniforme, Ag. 
In ponds ; frequent. 
N. alpinum, Kiitz. (N. cristatum, Bailey.) 
Bergen: Dripping rocks, Palisades. 
ANABAINA, Bory. 
A. flos-aquee, Kiitz. 
On stagnant fresh water ; common. 
