ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
421 
the aecidio-form), or (in the case of Angelicas') also on species of 
Polygonum. 
Mr. D. Griffiths * has studied the structure and development of 
Ampelomyces Quisqualis, which is parasitic on a variety of other fungi, 
themselves growing on a number of different host-plants. 
Under the name Colletotrichum Violae -tricolor is sp. n., Mr. Ralph E. 
■Smith j describes a new parasitic fungus very destructive to the leaves 
and petals of the cultivated pansy. 
Mr. D. M. Duggar J describes in detail the injuries to the sugar-beet 
caused by three parasitic fungi, Rhizoctonia Betae , Cercospora beticola , 
and Oospora scabies. 
A parasitic fungus exceedingly destructive to Coronilla montana in 
Germany is described by Herr P. Magnus § as Helminth osporium Born- 
miilleri sp. n. 
Amylocarpns encephaloides || — Herr G. Lindau describes the struc- 
ture and development of this little-known fungus, distinguished by the 
power of iodine to impart a blue colour to its spores. He places the 
genus in the Pyrenomycetes and in the Perisporiaceae, using the term in 
its wider sense. The special family in which it should be placed is the 
Plectascinese, but it differs from all the other genera in the absence of 
conidiophores, in the thick firm peridium, and in the form of the asci 
&nd spores. 
Reproductive Forms of the “ Black-Rot.”1T — M. J. Perraud states 
that Guignardia Bidwellii , the fungus which causes the “black-rot” of 
the vine, may maintain its vitality through the winter in the three 
following forms : — as stylospores developed from pycnids in the autumn ; 
as pycnids preserved intact ; and as sclerotes or peritheces. 
Monilia variabilis sp. n.** — Herr P. Lindner finds, on white bread 
moistened with dilute beer-wort, a remarkably polymorphic fungus, to 
which he gives this name. It forms white mealy flakes composed of 
long nearly cylindrical usually empty cells with small projections, on 
which are seated torula-like conids. The form assumed by the fungus 
is influenced to an extraordinary degree by the nature of the medium and 
the conditions of growth. 
Biology of Agaricus velutipes.tt — Mr. R. H. Bifftn has studied, 
under cultivation, the biology of Agaricus ( Gollybid ) velutipes. From 
the minute sclerotes one or two sporophores are formed directly, and from 
these again are produced one or more generations of sporophores. The 
great reduction in the size of the sclerotes appears to be correlated with 
this mode of propagation. The laminae of the sporophore are exposed 
from the first, the only approach to the formation of a “ velum partiale ” 
being afforded by the hairs of the recurved margin of the pileus pointing 
* Bull. Torrey Bot. Club. xxvi. (1899) pp. 184-8 (1 pi.). 
t Bot. Gazette, xxvii. (1899) pp. 203-4 (1 fig.). 
X Cornell Univ. Exp. Stat., No. 163, pp. 339-63 (many figs.). 
§ Hcdwigia, xxxviii. (1899) Beibl., pp. 73-4 (1 pi.). 
11 Tom. cit., pp. 1-19 (2 pis.). 
Comptes Rendus, cxxviii. (1899) pp. 1249-51. 
** Wochenschr. f. Brauerei, 1898 (1 fig.b See Bot. Centralbl., Ixxvii. (1899) p. 67. 
ft Journ. Linn. Soc. (Bot.), xxxiv. (1899) pp. 147-62 (3 pis ) 
1899 2 f 
