550 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
]ife-liistory of a parasitic fungus which causes great destruction of the 
tobacco crop in Sumatra. It is a PhytophtJiora, nearly allied to 
P. Phaseoli, and the author names it provisionally P. Nicotianse. 
MM. J. H. Wakker and F. A. F. C. Went* * * § give a detailed account 
of the diseases of the sugar-cane caused by parasitic fungi. 
M. R. Aderhold f describes a disease cf cucumbers caused by the 
attacks of Cladosporium cucumerinum ; as also of leaf-spots due to a 
possibly new species of Sporidesmium. 
A new disease of the almond, which appears on the young fruit, is 
described by Sig. U. Brizi,J who attributes it to a hitherto undescribed 
parasitic fungus, Gloeosporium amygdalinum sp. n. 
The principal diseases of the fruits of Citrus are treated of in detail 
by Mr. W. T. Swingle and Mr. H. J. Webber.§ Among those due to 
parasitic fungi are scab, caused by a Cladosporium , sooty mould or smut, 
and foot-rot, possibly due to Fusisporium Limoni. 
Potato Diseases. || — Dr. C. Wehmer discusses the literature, which 
has appeared during the past three years, relating to the fungus diseases 
affecting the potato. The subject is considered under several sub- 
divisions, and deals with (1) the blight (PhytophtJiora), (2) the scab, 
(3) the black rot, (4) the stem-rot ( Botryiis ), (5) the leaf-rot ( Macro - 
sporium and Phoma , (6) the wet rot (Bacteriosis), (7) the dry rot 
( Fusarium ), and other occasional diseases. At the end of the article is 
given a list of the works noticed. 
Mycorhiza.H — Herr G. F. L. Sarauw gives a very detailed his- 
torical account of the observations made by different writers from the 
year 1758 downwards, on tbe fungi which infest the roots of various 
plants, and on the question of their symbiotic parasitism. It is accom- 
panied by an index to the various families of plants in which the 
phenomenon has been observed. 
Mycorhiza of Listera cordata.** — Prof. R. Chodat and M. A. Lendncr 
describe the endophytic fungus which attacks the roots of this plant 
growing in marshy heaths. It is found only in those parts of the root 
which are covered with root-hairs ; here the mycelial filaments occur 
in bundles in hypodermal cells and traverse the root-hairs themselves. 
The relationship of the parasite to the host is a symbiotic one, no injury 
being sustained by the latter. The fungus produces Fusarium- spores 
(chlamydospores), and is regarded by the authors as neaily allied to 
Nectria. 
Rhizoctonia. jf — M. E. Prillieux has examined the dark hemispherical 
bodies found in the tissue of Pliizocton ia violacca, which attacks the roots 
of the saffron, beet, and lucerne ; and finds that they are not, as supposed 
* Arch. v. d. Java-Suikerindust., I89G Cl pi.). See Hcdwigia, xxxv. (1896) Rep., 
p. 76. 
f Zeitschr. f. Pflanzenkr., 1896, p. 72. See Hedwigia, xxxv. (1896) Rep., p. 84. 
X Zeitschr. f. Pflanzenkr., 1896, p. 65 (1 pi.). See Hedwigia, xxxv. (1896) Rep., 
p. 85. 
§ U.S. Department of Agriculture, Bull. No. 8, 1896, 1 pi. 
I| Centralbl. f. Bakteriol. u. Parasitenk., 2 te Abt., ii. (1896) pp. 261-71, 295-300. 
Bot. Tidssk., xviii. pp. 197-259 (2 pis.). See Bot. Centralbl., 1896, Beih.. p. 21. 
** Bull. Herb. Boissier, iv. (1896) pp. 265-72 (5 figs.), 
ft Bull. Soc. Bot. Fiance, xliii. (1896) pp. 9-11 (1 fig.). 
