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BIBLIOGRAPHY. 
Polyporus (Ovini) Mylittce , Cke. & Mass. (Grevillea, Vol. xxi., 
p. 37, Dec., 1892). 
Professor Saccardo, presumably having overlooked the descrip- 
tion of the highly interesting fungus mentioned above, has 
described the same as Polyporus Mylittce, Sacc., in Hedwigia, 
March- April, 1893, p. 56. 
Sur la classification des Basidiomycetes. Ph. Van Tieghem 
(Journ. Bot., Morot, Yol. vii., 1893, p. 77). 
According to the author, the immense class of fungi are divided 
into four orders : — 
1. Oomycetes. Thallus continuous, that is to say, not broken 
up into cells by transverse septa, and produce oospores, isogamous 
or heterogamous. 
2. Myxomycetes. Thallus consisting of free, mobile cells, that 
are destitute of a cellulose membrane. 
3. Ascomycetes. Thallus multicellular, cells furnished with a 
cellulose membrane, immobile ; spores formed, usually in definite 
number, within special mother-cells called asci. 
4. Basidiomycetes. Thallus multicellular, cells immobile, fur- 
nished with a cellular membrane ; spores produced, usually in 
definite number, upon special mother- cells called basidia. 
Considering the fact that the Myxomycetes have of late years 
been considered as distinct from the fungi, but not therefore 
necessarily outside the limits of the vegetable kingdom, it appears 
desirable that Van Tieghem should give us a definition of the class 
Fungi , as understood by him, thus furnishing a key-stone to his 
ordinal characters. 
The character founded on the absence of septa in the thallus of 
the Oomycetes is incorrect, although often given in books, septa 
being normally and habitually present in the vegetative portions 
of numerous species ; this feature is clearly shown in the four 
beautiful plates illustrating Van Tieghem’s researches on the 
Mucorini.* 
The Basidiomycetes are divided into two primary groups ; 
Acrosporece , spores apical on the basidium ; Pleurosporece , spores 
produced laterally on the basidium. These primary sections are 
in turn each broken up into two, depending on the basidia being 
one celled, or septate. 
The teleutospore in the Uredineae is described as a probasidium , 
the promycelium to which it gives origin on germination, the 
basidium , and the sporidia or promycelium spores are considered 
as the true spores. 
British Fungus-Flora. G. Massee. — The second volume of 
this work, dealing with the Agaricineae, is now ready. The third 
volume, containing the remainder of the Basidiomycetes and the 
whole of the Hyphomycetes, will be ready in September. 
* “ Ann. Sci. Nat./’ Ser. vi., Vol. i. (1875), p. 5, pi. 1-4. 
