184 



man. (Proc. Acad. Nat. Sci. Phil., Part I, 1890, 132-144). 

 Contains a complete list of the diatoms found, as noted in the 



Bulletin, Vol. xvi. Nos. 3 and 8. 



Grass — A New. Geo. Vasey. (Bot Gaz. xv. 106- no, PL xii). 



A new genus and species is founded upon specimens col- 

 lected by Dr. Edward Palmer at La Paz, Lower California. Its 

 relationships are with Uniola and Distichlis, The name proposed 

 for it is Rachidospcriniiin Mexicanitm, 

 Grasses in the Wrong Genus. W. J. Beal. (Bot. Gax., xv. 



1 10- 1 1 2). 



The genera Stipa and Oryj:^opsts are considered in this article, 

 with the result of placing Stipa Richardsoni, Link, 5. Mongolica, 

 Turcx., S. caduca, Scribncr, and vS. Pringlei^ Scribner, in the 

 genus Oryzopsis 

 Isles de la Madeliiie, — Liste des Plantes Rencontrer aux\ 



L'abbc L. Provanchcr. (Le Nat. Canadien, xix. 346). 

 Isol'tes echiiwspora^ Durieu. — Die Ersten Keimnngs stadien der 



Makrospore von. Douglas H. Campbell. (Ber. d. Deutsch. 



Bot. Gesellsch., viii. 97-100, t. V.; reprinted), 

 LemaneacecB of the United States — Monograph of the, — Geo. 



F. Atkinson. (Annals of Botany, iv. 177-229, PI. vii. viii. ix.). 



This order of fresh water Algae has been made the subject of 

 critical study by Prof Atkinson for the past five or six years, 

 and his results are embodied in this exhaustive monograph. The 

 plants inhabit turbulent water, rapids, mill-dams, etc., growing 

 generally at a depth of a foot or more. The morphology Is 



treated of under the three stages in their life history, (i) The 

 prostrate or permanent form, which in autumn gives rise to (2) 

 the Cha?itransia-^ovm and (3) the sexual shoot, which is developed 

 from the latter, the period of fertilization being in spring. The 

 development of the reproductive organs on this sexual shoot, of 



■ 



the protonema, the germination of the spores and the processes 

 of fertilization are described in detail. In the systematic part of 

 the paper all the seven United States species of Lemanea, the 

 only genus recognized, are thoroughly described. It is to be 

 regretted that the generic name Apona, Adans, which has long 

 priority, was not taken up. The plates illustrate the morphology 

 and anatomy of the plants in the greatest detail. N. L. B. 



