BULLETIN 
OF THE 
TORREY BOTANICAL CLUB. 
Vol. Xll.l New York, January, 1885- [No. I. 
Fresh-Water Algae. IX. 
By Francis Wolle. 
(Plate XLVii.) 
The opinion expressed in the preface to my Desmids of the 
United States, that the field for the study of our fresh-water alg^ 
has not by any means been exhausted, receives confirmation in the 
additions made during the summer of 1884 to our already respect- 
able collection of new species and varieties. The following list com- 
prises the names and descripcions of nearly fifty species and varieties 
new to the flora of the United States. They were gathered, some 
from the apparently inexhaustible ponds of New Jersey, some by the 
Rev. H. D. Kitchell in Florida, others in the neighborhood of Min- 
neapolis by Miss E. Butler, and a few from ponds of Pennsylvania. 
The plate which accompanies this article illustrates the species and 
varieties herewith described, and this, with four others, all of them 
colored, will form part of an appendix, or of a second volume of my 
work on the Desmids of the U. S., according to the quantity of ma- 
terial available at the time of publication. 
DESMIDIACE^.. 
Hyalotheca dissiiiens^ var. hians, n. var, — Cells one-half to as long 
a-s wide; closely conjoined, sides more or less arched, with a distinct 
central notch. Diameter 25-50/^. 
The large forms from Budd's Lake, N. J., the small from Mait- 
land and other localities, Florida. 
It is very nearly allied to a New Zealand species described by 
Nordstedt (ZT. hians). Some specimens from Florida present the 
appearance of undeveloped Dcsviidium qiiadraium and maybe related 
thereto; the larger New Jersey forms, however, give no evidence of a 
thickening border or of a twist. End view circular. 
Sphcerozosma pulchellum^ Archer, var. bambusmoides, Wittr. 
Florida, Minn, and New Jersey ponds. 
Penium {Cylindrocystis) tumidum, F. Gay. — Frequent in Toevi 
marshes, Florida.' 
Closterium junddum, Ralfs, forma gracillima Icetissima, Breb. 
Frequent in pond near Maitland, Florida. - 
C. lanceolafiun. Kg.— I received last summer hundreds of sped- 
mens of this species in a gathering made by Prof. F. W. Cragin, 
Kansas. Diameter 40-50/^. Length 225-300/i 
C didymotocum, Corda.— A large form and distinct variety corres- 
ponding to description by Delponte. Cytioderm not longitudinally 
striate, but smooth and apices obtusely rounded. Diameter 50-60;/. 
Minnesota and New Jersey. 
