PRODROMUS FLORE BRITANNICE 29 
cases which he records the fungus has been active for a year or two 
and has then disappeared, or “it has persisted seemingly without 
the intervention of the alternative host. riksson has .used 
similar facts in snpport of his theories, but Klebahn thinks 
that one oan explanation may easily be found to interpret 
such phen 
ong chapter’ is devoted to explaining culture methods, and 
the geographical re ee of the different hosts is discussed. The 
data to hand on this latter point are rather confusing; the hosts 
belong not Brsdueniiy to different soil formations and grow 
in nature far apart, nissan a distant transference of spores. 
The much-debated questio s to the function of the spermogonia 
various theories as to fertilization and to the fusion of nuclei in the 
Keondation.” termed by Dangeard and ‘Sapin Trouffy ‘* pseudo 
The second part of the book takes up the different species of 
hotarwelonss rust in detail. A complete index of parasites and host- 
plants is also So 
tells us that the book grew under his hand as 
he collected noes bearing on his own investigations. A biblio 
graphy occupying some twenty-seven pages testifies to the ain outit 
of literature that exists on the subject scattered about in many 
magazines, and which he has searched through to amass his 
ater 
in this branch of fungology as it has been to himself. It is safe to 
say that this hope will be amply justified. The book will prove a 
boon if nota necessity to all who desire to know what has been 
done, or to begin research in such an inviting field. No points of 
. Kle 
are of great value e has certainly earned the cca: of all 
Pasiiddogiets, dipestells of those who are in ees in ru 
r A L. Ss. 
Prodromus Flore Britannica. Part IV. By Freprertc N. Witiiam 
Agent: C. Stutter, 110, High Street, Brentford. 80 Nov., 1903. 
This part of thirty-two pages contains the account of thirty 
species ; it finishes the genus Hieracium, to which is added a com- 
plete index of ay the names of the species mentioned in this and 
the preceding part. Short notes are supplied, giving the Hiera- 
cium-list of the last edition of the London Catalogue, so that most 
of the names of the Catalogue which had not been ctherwige dealt 
with are accounted for. Next follow the genera Hypocheris, 
Taraxacum, Lactuca, Sonchus, and Tragopogon, thus ending the 
family Asteracee (Composite) and the order str rales. There have 
n 
189 pages, and compare with 234 species enumerated in the London 
Catalogue; if the ie standard for comparison is maintained 
