Vol. VI, No, 27.1 BoLtetin of THE TorREY BoTAanicat Cius. [New York, Mch,, 1877. 
§ 148. Fresh Water Algae. II. 
In putting forth this addition of one hundred species to the 
Fresh Water Algae of our country it is proper to preface it by a few 
brief remarks. 
In general I have followed the nomenclature of Dr, L. Raben- 
horst and others of the German schools, but, in a few instances, have 
deviated to the more modern arrangement suggested by the late Dr. 
‘M. G, Thuret, of France, as given to the public by his co-worker 
and successor, Dr. E. Bornet, of Paris. Unfortunately the new 
classification covers only one division, the “ Nostochinées,”’ 
_ Thuret set out with the idea that many genera have been created 
upon insufficiently defined characters, and that many species have 
been described from the same plant found by different authors in 
various localities in different stages of development. There is 
no doubt that many spurious forms are found on record as 
distinct plants. As an illustration I quote only one example. I 
found “Gloeotrichia’”’ in abundance in a pool near Buffalo, N. Y. 
The thalli varied in size from that of a mustard seed to that of a 
hen’s egg. ‘Trying to identify it, I found forms to correspond to no 
less than eight described species, yet evidently all one plant. Thuret 
suggests Gloeotrichia matans, to take in nine forms. My study of 
this subject has been brief, only three years, yet the wisdom of 
Thuret’s suggestion is evident. 
Dr. H. C. Wood, Jr., of Philadelphia, made the Fresh Water 
Algae a study for a couple of years, but abandoned it quite too soon. 
The result of his labors is a valuable work published by the Smith- 
sonian Institute, in many respects an excellent guide, and especially 
convenient as a compilation of all plants heretofore found in this 
country. Itis a great pity that he did not pursue his studies a longer 
time. Errors that crept into his work could have been most easily 
and satisfactorily corrected by himself. 
In the subjoined list only such species are named as are believed 
to be entirely new discoveries for the United States. All plants here- 
tofore positively quoted by Bailey, Olney, Wood and others, are omit- 
ted. Those not having the locality noted have been found within a 
circuit of about twenty miles around Bethlehem, Pa. Where the 
special habitat is omitted, it is supposed to be the same as that given 
by the author of the species. FrANcIsS WOLLE. 
: 1. Chroococcus, Naeg. Ch. rufescens, Naeg., Niagara, N. Y.— 
Ch. turgidus, Naeg. . 
2. Gloeocapsa, Ktz.—Gl. Itzigsohnii, Bornet. Shaded rocks.— 
Gl. janthina, Naeg. Cliffs, Niagara.—Gl. aeruginosa, Ktz. Niagara. 
—Gl. ochracea, Ktz.—Gl. gelatinosa, Ktz.—GI. mellea, Ktz, Color- 
ado. Gl. haematodes, Ktz. Swampy ground. 
3. Aphanocapsa, Naeg.—A. rivularis, Rabenh. In_ ponds, 
attached to wood or stone. 
4. Anacystis.—A. marginata, Menegh. Pools. — 
5. Polycystis, Ktz. P. piscinalis, Briig. Pools. 
j= Dorveny fated Frame OW Chir Br, 2%, 4.p- 203, 
