222 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
This Oidium form, however, produced no asci, and Hansen sought in 
vain for E. Magnusii , but he did find the particular Saccharomyces 
observed by Ludwig. 
Brefeld, however, was able to discover in material supplied to him 
by Ludwig E. Magnusii, the mycele of which showed both the Oidium 
form and asci ; but as it was unable to set up fermentation it was 
obviously distinct from the Oidium form discovered by Hansen. 
Hansen next obtained some fresh material from Ludwig, and found, as 
he had done before, only the Oidium form capable of exciting fermenta- 
tion, but not a trace of Endomyces Magnusii. Hence the suspicion that 
there was some genetic connection between Saccharomyces Ludwigii , the 
Oidium form, and Endomyces Magnusii was unconfirmed ; and the experi- 
ments which were made further showed that Brefeld’s hypothesis was 
untenable, viz. that the Saccharomyces was only a conid stage of higher 
fungi which in cultivation had failed to reach the higher form. 
Dr. F. Ludwig * * * § doubts the correctness of Hansen and v. Tavel’s 
separation of Endomyces ( Saccharomyces ) Ludwigii as a distinct species 
from E. Magnusii. There is no morphological difference between the 
two, the former being probably merely an earlier stage of development 
of the latter; and, even if the alleged physiological difference can be 
sustained — that the former has the power of producing fermentation, 
■while the latter has not, which is doubtful, this is not sufficient for the 
establishment of specific separation. 
Dematophora and Rosellinia. j — Sig. A. N. Berlese is of ’opinion 
that the parasitic fungus which causes “ pourridie ” of the vine is not, as 
is argued by Yiala,| the type of a new family, allied to the Tuberaceae, 
but is a Pyrenomycete nearly related to Bosellinia, if it is not to be in- 
cluded in that genus. Several species of Bosellinia have a perithece, 
with inconspicuous or obsolete ostiole, resembling that of Dematophora 
necatrix. 
Aureobasidium, a new Genus of Parasitic Fungi. § — MM. Viala 
and Boyer find that a disease of the vine which attacks the nearly ripe 
grapes in wet summers, is due to a hitherto undescribed fungus, which they 
name Aureobasidium Vitis , and which constitutes the type of a new 
genus of Hypochnaceae. The mycele is greatly branched and septated ; 
the basid is rounded at its apex and is indistinguishable at its base 
from the mycele ; from its spherical apex spring the small uncoloured 
sterigmas which bear the spores, usually 6 in number, less often 4 or 2, 
slightly curved when mature. 
Fungus-parasite of the Scotch Fir.|] — Herr F. Schwarz has inves- 
tigated the cause of a disease which has been very destructive to Pinus 
sylvestris in various parts of Germany, and finds that it is due to the 
attacks of a discomycetous fungus which is probably Cenangium 
* Bot. Ztg., 1. (1892) pp. 793-4. 
f Rev. Pathol. Veg., i. (1892) (3 pis.). See Bull. Soc. Bot. France, xxxix. 
(1892) Bev. Bibl., p. 171. t Cf. this Journal, 1891, p. 650. 
§ Ann. Ecole Nat. d’Agric. Montpellier, vi. (1892) p. 153. See Bull. Soc. Bot. 
Fiance, xxxix. (1892) Rev. Bibl., p. 129. 
|| Zeitschr. f. Forst- u. Jagdwesen, 1892. See Bot. Centralbl., 1892, Beih., p. 472. 
