338 



This IS an extended paper on the structure, nomenclature and 

 classification of the genera and species of this natural order, con- 

 sisting essentially of a critical review of the recent writings of 

 Professor Greene, Mr, Jas, Britten and others, a discussion of the 

 names to be adopted, in which the priority of specific and generic 

 names is rigidly maintained, and a synoptical list of them given. 

 This list would be a litde more perfect if Professor Lawson had 

 more rigidly applied the very principles for which he so forcibly 

 contends. Or is it a patriotic feeling which causes him to write 

 Victoria regia, Lindl (1838) rather than F. ^;;/^^^/nV^ (Poepp.)» 

 ^\^nz\\.,\Etirale Amazonica, Poepp. (1832) )? K\\6.\v\iy Nelimho 

 speciosa when this name is antedated by N. fiticiferaj Gaertn? 

 Castalia odorata is not to be attributed to Greene, but rather to 

 Woodville and Wood in Rees' Cyclopedia, to which exceedingly 

 rare work Professor Lawson appears to have access. In some 

 curious way no reference is made to C. Leibergiiy Morong, per- 

 haps the most critical North American species, and I suppose it 

 must have been overlooked. The specimens referred to C. odo- 

 rata, van viinor^ preserved in the herbarium of the Geological 

 Survey at Ottawa, are the same in which I recognized the 6. 

 tetragona of Japan and the Himalayas. NymphcBa Fkichen is 

 the name given to a supposed hybrid of iV". advena and N. micro- 

 pJiylla, recognized by Professor Caspary, collected by Mr. Flet- 



cher near Ottawa. 



N. L. B. 



Orcadella operculata, — A 7tew Myxomycete, Harold Wingate. 



(Proc. Phil. Acad. Sci. 1889, 280, 281, one figure). 



A new genus and species of slime-mould collected on the 

 trunks of living red oaks about Philadelphia and in Maine. 



Paraguay audits Flora, — H. Thos. Morong. (Bot Gaz. xiv. 

 246-253). 



Peronosporacece. — A List of the Kansas Species of, W. T. Swin- 

 gle. (Reprinted from Trans. 20th, 21st, Ann. Meetings Kans. 

 Acad. Sci., Nov. i, 1889). 

 Contains, besides the list of fungi, a complete bibhography 



and list of host plants. 



Pickerel Weed Pollen. —By ton D. Halsted. (Bot. Gaz. xiv. 255' 

 257, illustrated). 



Pinns laiifolia. C. S. Sargent. (Garden and Forest, ii- 49^» 



fig" 135)- 



