284 
The reader who wishes a digest of what was known up to 1890 on 
any of these subjects can not do better than to consult this book, for if 
he does not there find all lie needs the chances are that the footnote 
references to the literature of the subject will put him in the way of 
finding the rest. 
The last half of the book is devoted to a presentation of the syste¬ 
matic side of mycology. An account is given of each of the groups, 
and this is followed by a description of some of the more important 
genera. Naturally views differ as to classification. The most radical 
change, and one which will probably not meet with general acceptance 
is the exclusion of Synchytrium, Woronina , Olpidiopsis , Bozella , etc., on 
the ground that the production of a vegetative plasmodium is entirely 
foreign to the eu-mycetos, and allies these organisms to the Myxomycetes 
and other forms which the author follows De Bary in considering to be 
animals. 
The groups and families in Dr. ZopPs classification are arranged as 
follows: 
I. Phycomycetes. 
1. ChytridiaceaB. 
(1) Olpidiacoas. 
(2) RhyzidiaceaB. 
(3) Chladochytriaceco. 
2. Oomycetes. 
(1) SaprolegniaceaB. 
(2) Ancylistieae. 
(3) Peronosporeas. 
3. Zygomycetes. 
(1) Mucoraceas. 
(2) Chaeto-cladiaceao. 
(3) Piptocephalideas. 
(4) Entomophtlioreae. 
II. Mycomycetes. 
1. Basidiomycetes. 
(1) Protobasidiomycetcs. 
(a) Pilacreas. 
( b ) Auriculariaceao. 
(c) Tremellacese. 
( d ) Dacryomycetcs. 
(2) Hymenoinycetes. 
( a ) Hypoclinaceas. 
( b ) Thelephoraccm. 
(c) Clavarie®. 
(cl) Hydnaceae. 
(e) Polyporaceae. 
(MycOxV YCETESr-conl iiiued). 
(/) Agaricaceae. 
(3) Gasteromycetes. 
(a) Hymeaogastreie. 
(b) Sclerodermieae. 
(c) LycoperdaceaB. 
(cl) NidulariaceaB. 
2. Uredine.e. 
3. USTILAGINE JE . 
4. Ascomycetes. 
(1) Gymnoascaceae. 
(a) Saccliaromycetes. 
( b ) Exoasceae. 
(c) GymuoaseeaB. 
(2) PerisporiaceaB. 
(a) Erysiplieas. 
(b) Aspcrgilleae. 
(c) TuberaeeaB. 
(3) Sphasriaceae. 
(a) SphaBiiaeae. 
(b) HypocreaeaB. 
(c) XylaneaB. 
(d) HysteriaeaB. 
(4) Discomycetes. 
(a) Pezizaceas. 
(b) HelvellacefB. 
The author differs from Brefeld in keeping Gymnoascus among the 
Gymnoascem; from Rehm in classing Hysteriaem under Splimriacese; 
from Fischer and most of the recent systematists in including Plasmo- 
para, etc., under Peronosporaj and from Schroter in excluding Myxomy¬ 
cetes, etc., on the grounds already stated. 
