THE FRESHWATER ALGJE OF MAINE. 205 



Peduncles generally arching, and frequently bent over so as to 

 become pendulous, slightly clothed, especially towards the top, mtli 

 white adpressed hairs. CaJiix patent. Sepals with dark brownish 

 centre, and membranous yellow-green border, clothed with shaggy 

 hairs. Petals obovate or rather wedge-shaped, rather deeply 

 notched, strongly marked with brownish veins. The plant was not 

 advanced enough to show fruit. 



The leaf-outline is so like some form of 7?. bulbosus L. that when 

 out of flower it might easily be mistaken for it. Their texture 

 recalls that of Pi. glacialis to some extent. From ordinary montane 

 forms of acris it may be distinguished by the nearly glabrous, glossy 

 leaves, of different outline and texture, with blunt segments ; and 

 by the more strongly veined and more deeply notched petals. Its 

 patent calyx, of course, at once distinguishes it from Pi. bulbosus, 

 which is not an alpine plant with us. 



THE FRESHWATER ALG^ OF MAINE. 

 By Wm. West, F.L.S. 



In this Journal for last November I published a short paper en- 

 titled " The Desmids of Maine." Since then I have been enabled to 

 examine the material I have received from there with the result 

 that many more species have been observed, some of which are new 

 to the United States (these are prefixed with an asterisk in the fol- 

 lowing list), while one species and two varieties are new to science. 

 One of these varieties — the trigonal form of Micrasterias — is 

 extremely interesting, as I have never yet seen mention of such a 

 form of this genus. Many Algae other than Desmids have been 

 noted in the gathering, though some cannot be determined, as the 

 material having been collected chiefly for Desmids, was too scanty. 

 Still, many of the unmistakable minute species were in profusion, 

 so that I have included them in the following list, as well as those 

 Diatoms that I have been able to identify satisfactorily. These last 

 are arranged after Rabenhorst, the others after Wolle. 



I have again to thank my son, G. S. West, for valuable help 

 during the preparation of this paper. 



Fine conjugated specimens of Staurastruni brachiatum Ralfs, and 

 Closteriuni Diana Ehrenb., were observed. 



(Edogonium punctato-striatum De By. Interesting, as this was 

 only known in the United States from Florida. — (E. Poscii Wittr. 

 (Five other species of this last genus were seen with oogonia, but 

 the material was too scanty for specific determination, the form and 

 dimensions of the oogonia and cells agreed with the species. — CE. 

 carbonicum Wittr. — (E. fragile Wittr. — (E. rufescens Wittr. — 6E. 

 delicatuluin Kittz. — (E. Franklinianuni Wittr.) 



Cylindrorapsa geminella Wolle. 



MicrotJiamnion Kiltzinglanum Niig. 



Ulothrix subtilis Kiitz. var. tenerrima Kiitz. 



Conferva fioccosa Ag. — C. vulgaris Rab. — C. tenerrima Kiitz. 



