108 PLANTS OF RHODE ISLAND. 
ale cf ta al hie sal gall) > 7s 
ott oe de chal ol pol oe 
DESMIDIUM, Ag. 
cylindricum, Grev. Common. 
Didymoprium Grevillei, Ktz. Alg. Rhod. No. 116. 
Swartzii, Ag. Common. No. 118. 
Baileyi, (Ralfs.) 
Aptogonium Baileyi, Ralfs. Alg. Rhod. No. 119. 
Aptogonium, Breb. Quidnesset. 
SPH Z ROZOSMA, Corda. 
pulchrum, Bailey. Davisville. 
var. planum. Davisville. 
var. inflatum. Davisville. 
filiforme, Rab. Spectacle Pond. 
excavatum, Ralfs. Spectacle Pond. 
serratum, Bailey. Spectacle Pond, &e. 
pulchellum, (Arch.) var. bambusioides, Rab. Quite 
common, 
MESOTANIUM, Naegr. 
Endlicherianum, Naegr. Providence, &c. 
SPIROT ANIA, Breb. 
condensata, Breb. Providence, Mr. Lathrop, 
obscura, Ralf. Common. 
PENIUM, Breb. 
Digitus, (Ehrh.) Breb. Roger Williams Park, &c. No. 151. 
margaritaceum, Breb. Common. No. 150. 
interruptum, Breb. Providence, Mr. Lathrop. 
closterioides, Ralfs. Spectacle Pond, &e. 
truncatum, Ralfs. Davisville. 
minutum, Cleve. Woonasquatucket. 
polymorphum, Perty. Pocasset. 
Brebissonii, (Menegh.) Ralfs. Quidnessett. 
Navicula, Breb. Common. 
CLOSTERIUM, Nitsch. 
juncidum, (Ralfs.) Common. 
macilentum, Breb. Providence, Mr. Lathrop. 
gracile, Breb. Providence, &c. 
lanceolatum, Kg.* Common. 
didymotocum, Corda. Providence, &e. 
subtile, Breb. Quidnessett. 
angustatum, (Kg.) Davisville, &c. 
Lunula, (Ehrb.) Providence, Mr. Lathrop ; Spectacle Pond. 
No. 158. 
var. striatum. Providence, &c. 
* A very broad form is found in Blackamore Pond. 
