20 



Croton Alabaincnsis. C. Mohr. (Garden and Poorest, ii. 592, 

 fig. 150). 



Desmidieer frau Grlmland. Robert Boldt. (Bihang till 

 Kongl-Svenska Vet. Akad. Hand. xiii. Afd. III. No. 5, pp. 48 ; 

 two plates). 



r 



This is a list of Greenland Dcsmidiaccae, with localities and 

 descriptions of new species in Euastruiii, Cosuiariuni, XantJd- 

 dimn, and Staiirastrmn. The plates represent fifty-three of the 

 species and forms enumerated. The paper was noted some 

 months since in the " Botanisches Centralblatt," but this number 

 of the "Bihang" has only recently come to us. It contains also 

 a lengthy tabulation by the same author of the geographical dis- 

 tribution of all known arctic Desmids. 



Exotic Fungi—Some. M. C. Cooke. (Grevillea, xviii. 34, 35). 



Cintracta Patagonica, from Patagonia ; Dcndrodochiuin verti- 

 ctllatiivi, from South Carolina, Hydntun cretaceum, Gnomonia 



ipeltis 



M 



Eleocharis — The Genus in North America. N. I.. Britton. 

 (Journ. N. Y. Mic. Soc. v. 95-111, reprinted), 



Dr. Britton has here given us a critical account of the rela- 

 tionships and synonymy of this somewhat difficult genus, with a 

 careful account of the geographical distribution, and a valuable 

 numerical reference to the chief collections of each species and 

 variety. He finds that 40 species are North American, with 36 

 occurring in the United States, just *' double the number known 

 to Dr. Torrey in i8.s6." The author's conclusions regarding- 



t>"*'^'"fc» 



the value of certain characters in classification are important, and 

 are stated in the following sentence : ** I am not unaware that his- 

 tological details have been invoked in the classification of this 

 natural order, and I have been particularly impressed by the ex- 

 tremely minute and laborious researches of Palla as published in 

 Engler's Bot. Jahrb. x. 293, but as the results reached by him 

 appear to me to destroy natural alliances rather than to ascertain 

 them, I have not used the arrangement of the fibro- vascular bun- 

 dles of the stem as proposed by him, nor, indeed, have I found it 

 necessary to invoke it/' 



The paper is the result of studies e:?vtending over several years, 



) 



