1002 The American Naturalist. [November, 
form-species and form-genera being described as species and genera. 
Three orders are recognized, viz. : Coccobacteria, Eubacteria, and 
Desmobacteria. 
The orders of the Eumycetes are considered by Schroeter to have 
relationship indicated by the following disposition : 
1. Chytridiei. 
2. Zygomycetes. 
Sub-ord. Mucorini. 
Sub-ord. Entomophthorei. 
4. Ascomycetes. 
5. Uredine^. 
6. Auriculariei. 
7. Basidiomycetes. 
In the treatment of these orders, in the body of the book, the 
Protomycetes and the Ustilaginege are inserted after the Oomycetes, 
and the Ascomycetes and imperfect fungi are placed after the Basidio- 
mycetes. The Peronosporacei are divided into seven genera, vi^. : 
Pythium, Cystopus, Phytophthora, Sclerospora (including but one 
species, the Peronospora graminicola of Saccardo), Plasmopora (in- 
cluding Peronospora nivea Unger, P. obducens Schr,, and others), 
Bremia (including Peronospora ganglifomiis of De Bary), and Perono- 
spora, the latter still containing no less than 44 species, although con- 
siderably reduced, as indicated above. 
The Agaricacei are referred to many genera, the usual sub-genera of 
Agaricus being raised to generic rank. This gives us the name 
Psalliota catnpestris (Linn.) Schrot. for the common mushroom hitherto 
known as Agaricus campestris. The genus Agaricus, as thus indicated, 
contains 171 Silesian species. 
In glancing over the pages we notice that the familiar Schizophyllum 
commune oi Fries must give way to 6". alneum (Linn.) Schrot. 
So, too, our well-known Lycoperdon giganteum (the giant puff-ball) 
is to be known hereafter as Globaria bovista (Linn.) Schrot. 
A most useful host-index is included in the volume, which is pro- 
vided with full generic and specific indexes. The next volume will 
include the Ascomycetes and " Imperfect fungi."— Charles E. Bessev. 
