298 
and several rusts including Puccinia bullata on Conium, a species 
that may be expected upon our celery at any time. Two root 
fungi are represented, namely: Sclerotinia Libertiana, Fl., and 
Rhizoctonia violacea, Tul. Only one species bears the name of the 
publishers— Septoria Chrysanthemi, Cavara, on Chrys. Japonicum. 
The specimens are accompanied by a bibliography, synonomy, 
engraving giving various details and copious notes. __ B. D. H. 
Economic Fungi—By A.B. Seymour and F. S. Earle. Fasci- 
cles vi.—viii. (Nos. 251-400) are devoted to parasites on weeds, 
and are “auxiliary to the experiment station exhibit of weeds at 
the Columbian Exposition at Chicago, with the codperation of 
Byron D. Halsted,” etc. The 150 species of fungi represent in 
their hosts 36 families of plants. 
The order most largely represented is naturally the Composite, 
as it is the great weed family, but some others, as the Crucifere, 
Polygonaceze and Graminez are not far behind. There are 10! 
species of hosts. Some species of fungi are represented upon two 
or more hosts, as Cystopus candidus, wpon three crucifers; Perone-— 
spora Halstedit, upon four composites ; Colecosporium [pomee, upon 
three Jpomeas, and Puccinia Polygoni-amphibii, wpon three smart- 
weeds. Eleven new species are distributed (published elsewhere 
in the BuLtetin). One of these found upon two related hosts has 
_ been given a hyphen-word for the genera of the hosts, namely, — 
Cercospora Arcti-Ambrosie, Hals. : : 
One of the points of special interest is the considerable number 
of seedling hosts. Fungi are very likely most effective in check- 
ing weeds when the attack is early. The seed-leaves are often e 
the first organ to be attacked, and some specimens illustrate this 
important point. Se 
The collection is neatly mounted and substantially bound, and 
the editors should feel proud of their superior work. N.L. Be 
International Botanical Congress. The following notice is issued 
by Prof. J. C. Arthur, chairman of a committee recently appointed a 
by Prof. C. E. Bessey, Vice-President of the Section of Botany, — 
A ACATS : oe 
An International Botanical Congress will be held at Madison, ee 
Wis., U.S. A., beginning August 23, 1893, and continuing chet 
or more days. All botanists are eligible to membership, and are 
