80 
BIBLIOGRAPHY. 
countries. In the Netherlands they number 595, in Belgium 
718, in France 1406, and in Britain 1400. Undoubtedly France 
runs us very closely in all aspects, and probably would beat us if 
the French lists were equally exhaustive and complete. 
It is not stated whether the Netherlands Flora is to extend 
beyond another volume, but evidently the work is in good hands, 
and it is refreshing to see that the letterpress is in French 
instead of low Dutch. We observe also that Professor Oudemans 
does not appear to have much faith in spore measurements, as there 
is no attempt at giving them for the Hymenomycetes. 
M. C. C. 
On Nuclear Division in the Hymenomycetes. By Harold Wager, 
Ann. Bot., Vol. vii., p. 489. 
Until quite recently the presence of indisputable nuclei in the 
Basidiomycetes has not been demonstrated. In the present paper the 
author has not only detected these structures in the basidia of 
Agaricus stercorarius and A garicus mus carius, but has also shown that 
their division is karyokinetic, resembling, generally, that which 
takes place in the higher plants, with only slight differences of 
detail ; a well-marked spindle-figure is formed. A single nucleus, 
formed by the fusion of two or more pre-existing nuclei, is present 
in the young basidium ; this nucleus divides into two, each of the 
daughter nuclei dividing in turn. The four nuclei thus formed 
finally arrange themselves one at the base of each of the four 
sterigmata, and presumably pass through the sterigma into the 
spore at its apex, although the actual entrance of the nuclei into 
the spores was not observed. Some interesting and novel ideas 
are discussed respecting the behaviour of the nuclei towards red 
and blue stains, a subject which is just now attracting considerable 
attention. We trust the author will continue his investigations 
on this subject, and, in due course, give us the result of his 
investigations of the transversely septate basidia met with in the 
genera Pilacre , etc., constituting Brefeld’s Protobasidiomycetes. 
Three beautifully executed plates illustrate all the points indicated 
in the text. 
On Trichosphceria Sacchari , Mass., a Fungus causing a Disease oj 
the Sugar-cane. By G. Massee, Ann. Bot., Vol. vii., p. 
515 (one double plate). 
A detailed account of the life- history of the fungus is given. 
Lichenologische AusfliXge in Tirol , xxv., Der Arlberg. By Dr F. 
Arnold, Verhandl. der K. K. Zool.-Bot. Gesell. in Wien. 
1893. 
There is a genuine smack of nature embodied in the description 
of these rambles ; the author, while naturally paying most attention 
to lichens, does not fail to record the presence of mosses and 
