DIE WURZELPILZE DER ORCHIDEEN 449 
to be really and specifically instructivé. There is one illustration 
(p. 74) representing a hedgerow in spring; we are informed that 
Mustard, but they might almost as well 8 h 
oer The connection of several of these plates with practical 
tany is, indeed, not very close, as, for instance, that (p. 128 
representing ‘“ Boys and Girls 7. eleven to thirteen at work on 
Herbaceous and Rose Borders, June 
J. G. 
Die Wiirzelpilze der Orchideen, thre Kulter und thr Leben in der 
Pflanze. Von Dr. Hans B Syvo, pp. iv. ie 3 pls. 
; URGEFF. 
and 38 text figs. Fischer, Jena. Price, 6.50 ma 
M ork remains to be done on the vaicilé e fungus 
symbiosis in relation to the higher plants. One of the patra 
interesting chapters in this study is the association between 
fungi and the roots of Orchids, of which Dr. Burgeff gives sonnb 
account in the small volume now before us. The subject has 
already been carefully studi ae in recent years by Noel Bernard, 
si gus 
carefully examined fifteen different orchid fungi, does not venture 
an opinion as to whether they represent so many species or are 
mere growth forms, as no trace of sexual fructifications was foun 
he prefers to give them a group name with no systematic signi- 
ficance, namely, ce cba Dr. Burgeff describes in detail the 
various forms which he names according to the species-name of 
the Orchid from which shits were isolated, such as Orcheomyces 
pune: Seats a Ophr ys trav O. labiate from Cattleya labiata, 
ous forms are then arranged in four groups according 
to the paraiest and ids of growth of the hyphe and spores. 
An account of the nutrition oF the fungi is given in some detail. 
genous constituent. Atmospheric oxvaen is necessary for their 
development ; they are not aniiero 
In the second part of his work Dr. Burgeff gives an exhaustive 
account of the relation between the fungus and the orchid in the 
Bee erent in the fully develo lant 
The book is well illustrated and eee printed on a highly 
gress og which will look very nice so fet as the surface lasts. 
It fo useful contribution to the study of a berreereattng 
felatistiin between the fungi and the higher plan 
ahe 
