15 
■ 
t 
forms in the dichotomous branching, in the constrictions, and in the 
fruit. 
OPHIOCYTIUM, N^g.—O. cuspidatum (Bailey) Rab. Pond, 
Mt. Everett, Mass. This plant was discovered by Prof. Bailey more 
tTian thirty years ago in a pond in Rhode Island; but it has probably 
not been seen since. It never received a record in an American 
publication, and hence this note. The proportions are very unusual 
for a plant of this genus, the measurements being: diameter, 50/i; 
length, 150/^; length of aculei at ends of cell, 15;^. 
PROTOCOCCUS, Ag.— (A questionable genus.) P. vestilus, 
Reinsch. Ponds, New J ^ 
POLYEDRIUM, Nfeg.— Z'. gigas, Wittr. Ponds, Pennsylvania 
and New Jersey. . 
SPIROGYRA, Link.— 6*. calospora, Cleve. Collected by J. Reig- . 
hard, Ann Arbor, Mich. S. varians (Hass,) Ktz. Mountam 
springs. S. laxa, Ktz. Ponds, Pennsylvania. _ 
6". setifornns, var. inequalis, n. var.—K peculiar variety of this 
species, consisting of two sizes of filaments, the one 135^", the other 
Zoix in diameter; the two in conjugation. The smaller form has the 
thickness and the appearance of 5. niiida, but must be counted a 
variety of setiformis. Sometimes two larger filaments are in conju- 
gation, sometimes two smaller ones; but more frequently a larger and 
a smaller one are united. The spores in both cases are of the same 
size; a fruit-bearing cell of the larger filaments is not quite filled 
with the spore, but a spore-cell of the smaller tuaments is usually con- 
siderably swollen. ,-.!.. i ^ui,, ^ 
S. Hantzschii, Rab., and S. fusco-atra, Rab tne latter probably a 
form of decimlna. Mill., both from pools near Harrisburg, Penn 
ZYGOGONIUM, Ktz.-Z. Halfsii (Hass.) Ktz. Ponds and 
marsh lands of Bucks County, Penn. 
PLAGIOSPERMUM, Cleve.— i'. temie, Cleve, var. crassius, n. 
var. Shallow water, Bethlehem, Penn., and Florid^. 
MOUGEOTIA, D. By.— if. glyptosperma,\).'BY. Pona, Jvim- 
neapolis, Minn. ,,.. j c-Viniiriw 
GONATONEMA, Wittr.— C. ventricosum, Wittr. if\ shallow 
water on river shore. G. notabile (Hass.) Wittr. In a pond. Both 
species in the vicinity of Bethlehem, Pa. ^.t;^,,!-, 
These forms agree well, in size of filaments, length of articula- 
tions and dimensions of spores, with the plants described but 
neither has the geniculate character of the fruiting-cells ^""7 devel- 
oped; some are perfectly straight and others only f S'^^^J^^^^f "S; ^ 
CLOSTERIUM, Nitzsch.-C. costatim, Corda. Ponds, New 
Jersey and Pennsylvania. C. nasidum, Nord. C ^'^""""f"'":^''- 
C. Icussatum, Ktz. The latter agrees wnth the description 
except in size, having only about one-half the dimensions of the 
form described. It is true to its name. /i,-ffprs 
C. angustatum, Ktz., var. reticulatum, n. z/^r.-This torn d tters 
in havini the stri^ more or less spirally elongated, often producing a 
reticulated appearance. - ,^^^ff M^ec 
All the above, except the first, are from ponds, Mt. Everett Mass 
CALOCYLINDRUS, D. By.— C diplospora, Lund. 1 ona, mi. 
Everett, Mass. 
