4IO 



Reviews. [zoe 



Taphrina has no parennial mycelium, and therefore is entirely- 

 dependent upon spores for its propagation. The mycelium 

 shows a differentiation into a sterile and fertile portion, the 

 former alone giving rise to the asci. Fourteen species are in- 

 cluded in the genus, 



Magjiusiella is a new genus that differs from both of the 

 others in its more deep-seated mycelium and the formation of 

 asci between the epidermal cells, and not below the cuticle. Five 

 species are enumerated. 



Two non-parasitic genera, Endomyces Tulasne, and Ascocor- 

 ticium Brefeld, are also included in the Exoasceae. 



The remainder of the paper is mainly taken up with a 

 critical discussion of the parasitic genera, with descriptions of 

 all the described species, including their geographical distri- 

 bution. 



The paper is well illustrated by three excellent double litho- 

 graphic plates. Douglas H. Campbell. 



Maize: A Botanical and Economic Sitidy. (Contributions 

 from the Botanical Laboratory of the University of Pennsyl. 

 vania, Vol. i. No. 2.) By John W. Harshberger. This is a 

 paper of much interest, on the structure origin, and economic 

 importance of Indian corn. 



Minnesota Botanical St7(dies; Bull. 9. pt. i.: I, Prefatory Note; 

 II, The occurrence of sphagnum atolls in Central Minnesota, 

 Conway MacMillan; III, Some extensions of plant ranges 

 E. P. Sheldon; IV, On the nomenclature of some species of 

 Astragalus, E. P. Sheldon; V, List of fresh water Algae 

 collected in Minnesota during 1893. Josephine E. Tilden; VI, 

 On the poisonous influence of Cypripedinin spectabile and Cypripe- 

 ditun p7ibescens, D. T. MacDougal- — Prof. MacMillan' s paper 

 is an attempt to account for the formation of Sphagnum atolls 

 in lakes, with some account of the plants found on them. In 

 No. 3 Mr. Sheldon gives a list of a number of plants either 

 reported for the first time or rare in Minnesota, describing two 

 new species, Polygonum rigidnlum and Aster longtihts; Claytonia 

 latifolia an older varietal name is substituted for C Caj-oliniana; 



