86 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
genera : — Podonectria (with the conidial stage Tetracrium ), Pseudo - 
microcera and Discofusarium. On two plates the brightly coloured 
fungi are depicted ; a third plate gives microscopic drawings of 
spores, etc. A. L. S. 
Hansen’s Curve for the Sporulation of Yeasts. — H. Kufferath 
{Bull. 01. Sci. Acad. Roy. Belg., 1921, 7, 332-56). By means of 
cultures Kufferath has studied the sporulation 'of yeasts in cultures. 
He used cultures differing from those employed by Hansen to determine 
the first appearance of spores and the maximum of sporangia. He 
distinguishes three factors : (1) time, (2) temperature, and (3) some 
factor which expresses the apparition or the production of some well- 
determined phenomenon in the life of the organism.” The author 
gives the subject a very wide application to biological life. A. L. S. 
Pythium Butleri sp. n., a Peronosporaceous Parasite of Various 
Cultivated Plants in India.— I. S. Subramadan {Mem. Dept. Agric. 
India , Bot. Ser., 1919, 10, 181-94, 6 pL). This fungus has caused 
much damage in nurseries of tobacco and pepper plants in Pusa, etc. 
The disease has also been found on pimento and on the papau tree. 
Inoculation proved that Pythium Butleri was in each case the cause of 
the withering and rotting. Various remedies are suggested. A. L. S. 
Memoranda and Index of Cultures of Uredineae, 1899-1917. — 
T. C. Arthur ( Mycologia , 1921, 13, 230-62). The author gives a 
summary of this cultural work on Uredineae over a period of nineteen 
years at Purdue University. During the progress of the work he 
alone, or with an assistant, made many excursions over a large part of 
the States. Much new work was done on Gy mno sporangium , though 
most attention was given to sedge and grass rusts. As a result of 
cultures sixteen species were described as new. A summary of all the 
cultures is tabulated and a fungus as well as a host-index is given. 
A. L. S. 
Reaction of F 2 Wheat to Rust. — Gf. F. Puttick ( Phytopathology , 
1921, 11, 205-13). Crosses were made between Triticum durum and 
T. vulgare, and the F 2 generation was tested by various biologic forms 
of Puccinia graminis. The two crosses of the hosts were found to react 
reciprocally to the two rusts. Seedling plants were infected easily, but 
the biologic forms of the host were constant in their degrees of suscepti- 
bility, and it is concluded that varieties of wheat immune to infection 
may be cultivated. A. L. S. 
Self-sown Wheat in Relation to the Spread of Rust in Aus- 
tralia. — W. L. "Waterhouse {Agric. Gaz. New South Wales , 1920, 31, 
165-6). In June the plants of self-sown wheat were found to be badly 
rusted by Pwcinia graminis in the uredo and teleuto stages, while no 
sign of the fungus was found on the cultivated crop. At the end of 
August self-sown wheat was badly rusted by Puccinia triticina. The 
observations are far from complete, but they show the importance of 
self-sown wheat as an agency in the spread of rust by means of uredo- 
spores. A. L. S. 
