244 
8UMBIARY OF CURRENT RESEARCHES RELATING TO 
flat round discs. Two species, A. Cordise and andina, both on species 
of Cordia. 
Trichospora bears the same relation to Cronartium as Clirysopsora 
does to Puccinia. Only pycnids and teleutospores have been found. 
The division of the spores and the production of sterigmas resemble the 
processes in Clirysopsora. T. Tourneforlise on two species of Tournefortia. 
Disease of the Olive.* * * § — M. G. Boyer gives a careful description of 
Cycloconium oleaginum, a fungus which has as yet been observed only on 
the olive. It grows on both sides of the leaf and on the peduncle, but 
is rare on the olives themselves. If the yellow spots on the upper 
surface of the leaf are microscopically examined, they will be found to 
consist of three concentric regions, an external region occupied by the 
peripheral extremities of the mycele, a middle region where spores are 
developed, and an internal region which is occupied by spores more 
completely formed. The spores are yellowish-green, with a single or 
sometimes two transverse septa. 
Coleosporium Pini sp. n.t — Mr. B. T. Galloway finds this new para- 
sitic fungus on leaves of Pinus inops. Only teleutospores have been 
observed, which are two- to four-celled. It was always found in con- 
junction with Peridermium cerebrum, w itb which it has possibly a genetic 
connection. 
Penetration of the violet Rhizoctone into the Beetroot and 
Lucerne.} — M. E. Prillieux states that a great number of cultivated 
plants, particularly saffron and lucerne, are killed by a fungus to which 
De Candolle has given the name of rhizoctone. It forms a network of 
filaments, at first whitish, then violet, in the middle of which are 
found a quantity of small hemispherical bodies of a deep colour, and the 
nature of which is but imperfectly known. The author describes 
carefully the structure of the rhizoctone in the bejtroot and in lucerne ; 
in the latter case we have the same structure as in the former, but on a 
somewhat larger scale. The filaments of the mycele also, under certain 
.conditions, penetrate the living tissues of the host. 
Fungus-parasites on Animals. § — Prof. E. Blanchard gives an 
account of the following parasitic fungi which are transmissible from 
the lower animals to man, and vice versa , including their structure and 
development, and their pathogenic effects: — Trichophyton depilans Meg., 
T. tonsurans Malm., Actinomyces bovis Harz., Microsporon Audouini Grub. 
Micromyces Hoffmanni.|| — Prof. M. Gruber demonstrated a micro- 
organism closely resembling Actinomyces in its morphological characters. 
The fungus is made of delicate branching hyphrn with thickened occa- 
sionally calcareous ends. When grown on sugar it produces acetic 
acid. Its pathogenic action differs from that of Actinomyces in produc- 
ing a local abscess which opens spontaneously. Babbits are specially 
subject to its influence. 
* Journ. de Bot. (Morot), v. (1891) pp. 431-9 (1 pi ). 
■f Journ. of Mycol., vii. (1891) p. 44. See Bot. Centralbl., xlviii. (1891) p. 296. 
J Comptes Rendus, cxiii. (1891) pp. 1072-4. 
§ Journ. de Micrographie, xv. (1891) pp. 313-7. 
|| International Congress of Hygiene and Demography. See Lancet, ii. (1891) 
p. 377. 
