BULLETIN 
OF THE 
rORREY BOTANICAL CLUB. 
Vol. Xll.l December, 1885. [No. 12. 
Fresh-Water Algae. X. 
By Francis Wolle. 
(Plate LI.) 
Two weeks spent in Florida, in the latter part of the month of 
March last, an occasional exploration nearer home and a few par- 
cels from correspondents, suggested the following notes referring 
mainly to plants new to the United States. They are arranged in 
the order of proposed classification of our fresh-water algae. 
Eciocarpus, Lyngb. E. rivularis, n. sp. — Tufts loose, 2-6 inches 
long, dark ol;ve-green ; filaments stout and firm, much branched ; 
branches erect patent, mostly alternate, decompound; stems and 
branches tapering. Diameter of lower part of stems often 250//, 
branches loo/i, more or less; articulations of stems and of branches 
rarely more than half as long as wide, often shorter ; propagula rare, 
elliptic-oblong, acute, subsessile, constricted at base ; older parts of 
stems corticulate, at first marked by longitudinal threads over the 
articulations, then by an irregular reticulation. 
The Edocarpi form a family of about fifteen species in our 
An-ierican marine waters, abundant along the ^Atlantic and Pacific 
coasts. The new species, E. rivularis, is claimed for fresh water. 
It has hitherto been found in only three known localities in Florida. 
The first discovery, made by myself, was in a fresh water marsh pool 
about two miles inland from Green Cove Spring, March, 1885. A 
month later. Rev. H. D. Kitchel found the same plant at Blue 
the sea. 
Joh 
J. Donnell Smith in 1878, 
and sent to me, I discovered the same plant and made an illustra- 
tion in my sketch book, but did not identify it then. The specimen 
came intermingled with other fresh-water algas. 
Among marine forms the plant is nearest Ectocarpus Durkeei, de- 
scribed by Harvey in his Nereis Boreali-Americana. More modern 
authors consider this form a mere variety of E. granulosus, Ag.; 
•however this maybe, it coincides with neither; besides affecting fresh 
water, it is much more rigid and robust, and the articulations of the 
stem kre shorter, usually less than half the diameter. ^ 
Thorea Bory. T. ramosissima, Bory.— Lake Osceola, l^londa. 
The specimen found was small, but sufficient for identification. 
CEdo^ronium, Link. (Ed. acrosporum, D.B., var. longatum, n var. 
Diameter of filament 7-8;/; much more slender than in the forms 
described, and the cells more elongated, averaging twice the usual 
length, 5-1 1 times longer than broad. 
