10*2 Some Alga' of Minnexofa Arthur. 



i»iven as G. Pianni; but if so it is the only eastern stiitloii known 

 to the writer. 



According to our present information then the plant seems 

 most abundant in the Upper Mississippi Valley, at least in its 

 floating form. It is not, however, peculiar to America. The 

 paper by MM. Hornet and Flahault§ already referred to gives the 

 result of an examination of the present sources of information re- 

 garding the JtivularitJB forming scums, all of which are referred to 

 the single species Olwotrichm Pmun Thuret, the true members of 

 the genus Bivularia being salt water algae. It was observed in the 

 British Isles as early as 1804, and described and figured in Smith's 

 English Botany under the name Conferva {Rioularia) echinulafa, 

 which was changed to KchlneUa articiilata by Agardh. The 

 next record"! of its occurrence is in a lake near Aberdeen, Scot- 

 land, in 1840-47-18. It was seen in the early part of July, and 

 the description of its appearance corresponds essentially to its 

 mode of occurrence at Waterville. Specimens gathered in Shrop- 

 sliire, England, are figured by Kuetzing,** and also by Phillips,tt 

 from a later gathering. The similarity of our plant to the above 

 was pointed ont by Dr. Farlow.* Mr. Phillips stated that the 

 fishermen believe it useless to try to fish while it is abundant be- 

 cause the fish appear to be made sick by it, and will not bite- 

 Prof. Cohn t describes its occurrence on the river Neba in Pom- 

 erania, as seen by Dr. Schmidt, and the remarkable abundance and 

 the suddenness of its appearance and disappearance are especially 

 in accord with the observations at Waterville. He called it Rivu- 

 Jaria ffnifans. Through the kindness of M. Bornet 1 have been 

 able to examine authentic s})ecimens from this locality and do not 

 ttnd them noticeably different from the Waterville plants. In 

 the same year (1877), Dr. Gobi J found a Jlivnlaria on the coast of 



§ Bull. Soc. Bot. de France, xxxi, page 76. 

 Syst. Alg., page 16. 



1i Dickie, Botanist's Guide to Aberdeen, etc , 1880, page 310; quoted by 

 Cooke, Grevillea, x, page 112. 



'!■* Tabula' Phycologiji;, page 4. 



+t Grevillea, tx, page 4. 



* Bot. Gazette, viri, page 246 j Proc. Amer. Assoc. Adv. Sc, xxxii, page 

 30f). 



t Jahres-Ber. d. Schlesischen Gesells. f. vaterl. Cultur. (1877), page 144; 

 Hedvvigia (1878), xvi, page 1. 



X Hedwigia, xvr, page 37. 



