ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
651 
similar mycele turned brown; as external rhizoidal strings, formed 
from a condensation of the first form ; as external rhizomorphs 
(j Rhizomorpha fragilis var. subterranea ) ; the same more completely- 
organized ; as subcortical rhizomorphs (Pt. fragilis var. subcorticalis) ; 
and as an internal mycele. The reproductive forms are again five in 
number, viz. : — (1) chlamydospores on the white or brown mycele 
(very rare) ; (2) sclerotes on the internal mycele ; (3) conidiiferous 
filaments springing from the sclerotes or from the floccose mycele ; 
(4) pycnids; (5) ascosporous fructification or peritheces. All these 
forms are very rare in nature, but may be produced in cultivation. The 
fungus is equally capable of carrying on a parasitic and a saprophytic 
existence, and propagates, in nature, almost entirely by its mycele. 
The distinction between D. necatrix and D. glomerata is pointed out ; 
and the life-history of the other fungi which cause “ pourridie ” is 
described. 
Parasites of the Vine.* — Sig. F. Cavara describes in detail the life- 
bistory of Peronospora viticola and of Coniotliyrium Diplodiella , and the 
nature of the diseases which they cause in the vine. Of the latter 
species, Phoma Briosii and P. baccse are only immature forms ; as is 
perhaps Greeneria fuliginea. 
The following new Italian fungus-parasites of the vine are de- 
scribed : — Among Pyrenomycetes Physalospora baccse sp. n. ; among 
Sphaeropsideae Phoma lenticularis sp. n. ; among Melanconieae Glceospo- 
rium Physalosporse , Pestalozzia viticola, Alternaria vitis , and Napicladium 
pusillum spp. nn. ; also Briosia ampelophaga gen. et sp. n. The new 
genus Briosia is placed among the Stilbeae, near to Heydenia, with the 
following diagnosis : — Stroma verticale, cylindraceum, stipitatum, 
hyphis fasciculatis compositum, apice capitulum compactum efformans; 
conidia globosa, typice catenulata, fusca, acrogena. Among Tuber- 
cularieae Tubercularia acinorum is a new species. 
Sclerotinia Rhododendri.j — Herr W. Wahrlich gives a full descrip- 
tion of the structure and life-history of this fungus, which is parasitic 
on the capsules of the alpine species of Bhododendron. The asci contain 
eight ovoid ascospores, and the fungus is propagated also by sclerotes. 
Bitter-rot of American Grapes.^— According to Sig. F. Cavara, the 
characters of Greeneria fuliginea , the fungus which produces the “ bitter- 
rot ” of American grapes, are identical with those of Melanconium , under 
which genus it should henceforth be placed. It is not therefore, as he 
previously supposed, identical with Coniothyrium Diplodiella and Tuber- 
cularia acinorum. 
Root-brown of Lupins.§ — Herr W. Zopf describes this new disease 
of lupins, caused by the attacks of Tltielavia basicola , a fungus belong- 
ing to the Pyrenomycetes, and to the Perisporiaceae. Besides two kinds 
* Atti 1st. Bot. Univ. Pavia, i. pp. 293-323. See Bot. CentralbJ., 1892, Beih., 
p. 146. 
t Ber. Deutsch. Bot. Gesell., x. (1892) pp. 68-72 (1 pi.). 
% Atti 1st. Bot. Univ. Pavia, i. pp. 359-62. See Bot. Centralbl., 1892, Beih., 
p. 150. 
$ Zeitschr. f. Pflunzenkranklieiten, i. (1892) pp. 72-6. See Bot. Centralbl., 1. 
(1892) p. 213. 
