339 



THE DESMIDS OF MAINE. 



By Wm. West, F.L.S. 



Prof. Aubert, of Maine State College, in answer to my request, 

 has kindly sent me two small gatherings of Desmids which he made 

 this summer in the neighbourhood of Orono. I have come across 

 some Algas belonging to other groups during the examination of 

 them, which I shall not now enumerate. 



When I had just about finished my examination of the 

 gatherings, I received a paper entitled ■ The Fresh-water Algas of 

 Maine,' by F. L. Harvey (Bulletin of the Torrey Botanical Club, 

 June, 1888), in which the writer enumerates for the first time the 

 Fresh-water Algas of that State. Among these are forty-seven 

 species and two varieties of Desmids. Of these I have so far 

 noticed in Prof. Aubert' s gatherings thirty-five of the species and 

 one of the varieties, in addition to which I have also noticed those 

 enumerated in the following list, comprising seventy-three species 

 and five varieties and forms, none of which are contained in Mr. 

 Harvey's list, so that the total number of the Desmids known for 

 Maine consists of 120 species and seven varieties and forms. 



The gatherings cannot be said to be thoroughly exhausted until 

 naore of the material is worked up. I have to acknowledge my 

 indebtedness to my son, G. S. West, for valuable assistance 

 rendered during the preparation of this paper. 



One form of Staurastrum pygmmim Breb. was noticed several 

 times, the end view of which had the angles much more pointed 

 than usual. Some of the Cosmarium Meneyhinii Breb. noted were 

 not more than 11 /x broad, though typical as to shape. Examples 

 of Staurastrum saxonicnm Buln. were seen with the spines much 



stouter than they are shown in Wolle's figure. Zygospores of 

 Cosmarium amcenum Breb. were seen. 



Desmidium aptogonium Breb. Wille's fig. 81, tab. xiv. <Nor- 



Splmrozosma pulchrum Bail., var. denskiold's Expedition, 1875.' 



plamim Wolle. 

 &j^/ome Raben. 

 S. excavatum Ralfs. 

 Penium crassa De Bary. 

 -P. spirostriolatnm Bark. 

 Closterium obtusum Breb. 

 ft jitncidum Ralfs. 

 ft gracile Breb. 

 ft didymotocum Corda. 

 ft angustatum Kutz. 



C. acerosum Ehrenb. 

 & turgidum Ehrenb. 



ft Comu Ehrenb., form, major C. globosum Buln. 



Wille. This has not been re- C. bioculatum Breb. 



corded as yet for the United C. tinctum Ralfs. 



States ; it agrees exactly with C. sejunctum Wolle. 



C. acutum Breb. 

 C\ Diana Ehrenb. 

 Docidium crenulatum Rabenh. 



D. truncation Breb. 

 D. Archer i Wolle. 

 Calocylindrm Ralfsii lurch. 



C. connatus Breb. 



Cosmarium DeBaryi Arch. This 

 is not like Wolle's figure, but 

 exactly like that of Cooke in 

 his 4 British Desmids/ 



C. qitadratum Ralfs. 



z2 



