286 
Bambusina, Ktz.—B. Brebissonii, Ktz. Not a rare plant, but new 
in the various conditions of development. Pond, N. Jersey. 
Cosmarium, Corda.—C. commisurale, Breb.—C. Brebissonii, Me- 
negh.—C. Cucurbita, Breb——C. amoenum, Breb. All from 
Florida. Coll. J. D. Smith. 
Euastrum, Ehrb.—E. spinosum, Ralfs.—E. humerosum, Ralfs.— 
E. pinnatum, Ralfs.—-E. crassum, Breb.—E. insigne, Hassall.—E. 
Ralfsii, Rabenh.—E. abruptum, var. evolutum, Nordstedt. 
All from ponds, Darien, Ga. Coll. H. W. Ravenel. 
Micrasterias, Ag—M. rotata, Ralfs—M. fimbriata, Ralfs.—M. 
ringens, Bailey. Florida, J. D. Smith. M. radiosa, Ralfs.— 
M. crenata, Breb.—M. arctuata, Bailey. Ponds, N. Jersey. 
Staurastrum, Meyen.—St. tumidum, Breb.—St. Cerberus, Bailey. 
Coll. J. D. Smith, Florida. 
Xanthidium, Ehrb.—X. cristatum, Breb. Florida—X. armatum, 
Breb. N. Jersey. 
ZYGNEMACEAE. 
Spirogyra, Link.—Sp. fluviatilis, Hilse-—Sp. subsalsa, Ktz. both 
from Florida. Coll. J. D. Smith.—Sp. irregularis, Naeg. Coll. 
Dr. Beardslee, Ohio.—Sp. decimina, Muller.—Sp. protecta, 
Wood.—Sp. insignis, Hassall.—Sp. gracilis, Hassall—Sp. stag- 
nalis, Hilse.—Sp. intermedia, Rabenh. ; 
Zygnema, Ktz.—Z. subtile, Ktz. Darien,Ga. Coll. H. W. Ravenel, 
—Z. tenue, Ktz. Pleasant Mills, N. Jersey. 
Zygogonium, Ktz.—Z.conspicuum, Ktz. Mountain springs, Penn- 
sylvania and Maryland.—Z. Agardhii, Rabenh. Frequent in 
Florida. Coll. J. D. Smith. 
Mougeotia, de By.—M. laevis, Archer. Coll. J. D. Smith, Florida. 
Sirogonium, Ktz.—S. strictum, Ktz. Coll. J. D. Smith, Florida. 
Mesocarpus, Hassall—M. parvulus, Hass.—M. intricatus, Hass.— 
M. robustus, de By.—M. radicans, Ktz. 
Pleurocarpus, A. Br.—/. Columbianus, n. sp. P. libere natans, 
caespitibus dense intricatis, sordide viridis; cellulis diametro 
0016” (0015””—.0017”) 5-8 plo longioribus. 
Hab. in stagnis, Bethlehem, Pa. This plant differs from 
the described forms in the thicker filaments and the longer 
articulations. 
Staurospermum, Ktz.—S. capucinum, Ktz. Pleasant Mills, N. 
Jersey. A beautiful plant. The quadrangular spores and the 
filaments are considerably thicker than the measures indicated 
by Rabenhorst. They are more like the Swedish plant de- 
scribed by Wittrock under the same name. 
Vaucheria, DC.—V. sessilis, DC.—V. vesiculosa, Ktz. At places 
flooded by marine waters. N. Jersey. A very distinct species. 
Dr. Rabenhorst questions the right of its place in this genus. 
The large, spherical, vesicular spores, are usually terminal on 
the branchlets, but occasionally also interstitial. Antheridia 
are not found. The general appearance and growth are Vau- 
_. cheria like. For the present I retain the place chosen for the 
plant by Kitzing. . 
