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PLANTS OF RHODE ISLAND. 105 
COELASTROUM, Naegr. 
microsporum, Naegr. Common. 
SORASTROUM, Kg. 
spinulosum, Kg. Common. 
SCENEDESMUS, Meyen. 
caudatus, Corda, var. typicus, Kirch. Everywhere. 
S. quadricauda, Breb. Alg. Rhod. No. 166. 
dimorphus, Kg. Not uncommon. 
acutus, Meyen. Quite common. 
obtusus, Meyen. Quite common. No. 167. 
rotundatus, Wood. Providence. 
OPHIOCYTIUM, Naegr. 
cochleare, A. Br. Very common. 
capitatum, Wolle. Brook at Davisville. 
parvulum, (Berty,) A. Br. 
circinatum, Wolle. Quite common. 
cuspidatum, (Bailey,) Rab. Not common. 
Closterium, —, Bailey. Alg. Rhod. No. 161. 
CHARACIUM, A. Br. 
ambiguum, Herm. Spectacle Pond. 
Neegelii, A. Br. Not uncommon. 
heteromorphum, Reinsch. Pocasset. 
PROTOCOCCUOUS, Ag. 
viridis, Ag. Everywhere. 
var. angulosa, (Menegh.) Common. 
var. dissectus, (Naegr.) Common. 
var. Miniatus, (Naegr.) Common, 
var. infusionum, (Rab.) Common. 
var. botryoides, (Rab.) R. W. Park. 
var. gigas, (Kg.) Quidnessett, &c. 
var. Wimmeri, (Rab.) Spectacle Pond. 
var. vestitus, (Reinsch.) Pocasset, &c. 
POLYEDRIUM, Naegr. 
trigonum, Naegr., var. bifurcatum, Wille. Davisville. 
gigas, Wittr. Pocasset Pond. 
minimum, A. Br. Spectacle Pond, &e. 
longispinum, (Pertz.) Rab. Quidnessett. 
Palmellacee. 
DICTYOSPHARIUM, Naegr. 
reniforme, Bulnh. ‘‘ Ponds now and then,” rarely plentiful. 
