410 Reviews. [ZOE 
Taphrina has no perennial 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. 
_ Magnusiella 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- 
tictum Brefeld, are also included in the Exoascez. 
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. DoucLas H. CAMPBELL. 
Maize: A Botanical and Economic Study. (Contributions 
from the Botanical Laboratory of the University of Pennsy]- 
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 Studies; 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 Algz 
collected in Minnesota during 1893, JosEPHINE E. TirpENn; VI, 
On the poisonous aoe of Cypripedium spectabile and Cypripe- 
dium pubescens, D. 'T. MacDouGaL.—Prof. MacMillan’s paper 
is an attempt to ae ‘ek the formation of Sphagnum atolls 
in lakes, with some account of the plants found on them. I 
- 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 rigidulum and Aster longulus; Claytonta 
latifolia an older varietal name is substituted for C. Caroliniana; 
