66 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Fungi on Aleurodes vaporarium. — A. S. Horne (Ann. App. Biol.. 

 1915, 2, 109-11) lias investigated an occurrence of Cladosporium and 

 Gephalosporium on Aleurodes nymphs. He gives an account of similar 

 attacks, but does not find that parasitism has been proved. A. L. S. 



Empusa Muscae on Musca domestica. — H. T. G ssow {Ann. 

 App. Biol., 1917, 3, 150-8, 1 pi.) has published some notes on the 

 possibility of using the Empusa fungus as a pest of home-flies ; and he 

 adds observations he has made on the germination of the spores. 



A. L. S. 



Cell-regeneration in Botrytis cinerea. — Some notes on this sub- 

 ject have been published by W. B. Brierley {Ann. Bat., 1918, 32. 

 601-4, 3 figs.). He found that on injured cells the protoplasm could 

 form new membranes and resume healthy growth. He describes several 

 different cases in which this happens, and contrasts it with the myco- 

 plasma theory of Eriksson. A. L. S. 



Illustrations of Fungi. — W. A. Murrill {Mycologia, 1918, 10, 

 177-81, 1 col. pi.) publishes descriptions to accompany a coloured plate 

 drawn by Miss Eaton. There are nine of the smaller Agarics figured, 

 four of which are exclusively American. The others occur also in 

 Europe. A. ]j. S. 



Notes on Hypholoma.— Edward T. Harper {Mycologia, 1918, 10. 

 231-4, 1 pi.) describes some Agarics belonging to the Hypholoma lacri- 

 mahundum group. He discusses the differences between various closely 

 related species, such as H. lacrimalmndum and H. storea var. cmspitosum. 



A. L. S. 



Coriolus prolificans and C. versicolor on Peach Trees. — J. A. 

 Elliott {Phytopathology, 1918, 8, 615-7) finds that these two fungi 

 may cause wood-rots. The attack of the fungi followed severe pruning ; 

 the trees grew on heavy soil ; others on light soil escaped. A. L. S. 



Effect of Weather on the Attacks of Parasitic Fungi.— J. E. 

 Weiss (.^e?'/sc/zr. Pflanzenl^r ., 1918, 28, 116-42) made careful examin- 

 ations, in the same area, of the prevalence of a large number of fungus 

 diseases during two successive summers, 1916 and 1917. The former 

 summer was wet and the parasites were abundant. During the following 

 season there was less rain, and an exceptionally dry spell of weather at 

 the beginning of May seemed to have acted as a very effectual check on 

 the growth of the fungi. Weiss describes in considerable detail the 

 comparative growths in about forty different fungi ; in some cases the 

 parasite failed to appear. Flasmodiophora Brassicse and smuts are 

 closely affected by moisture in the soil. In almost every case the author 

 recommends the methods best suited to check the disease. He also 

 notes that Entomosporium maculatwn, which causes spotting of apple 

 and pear trees, appears late in the season (August and September) ; 

 unlike most other fungi it is able to pierce the mature cuticle of the 

 leaf. Crotiartium ribicola and Ceratophorum setoswn are also developed 

 late in the season. A. L. S. 



