90 SUMMARY OF CURRENT RESEARCHES RELATING TO 



are previously injured ; the injury in most cases being due to frost. 

 He notes the localities and soils most favourable to such attacks. He 

 advises early sowing as a preventive, and the selection of good strains of 

 seeds. 



Diseases of Sugar Beet.* — Fr. Bubak found in addition to 

 Cercospora Beta, another fungus on the leaves, Ramularia Beta. The 

 latter is entirely colourless, and forms its spores on the under side of the 

 leaf. The author thinks that probably the Ramularia is closely con- 

 nected with Phyllosticta Beta 1 . The two genera are often found on the 

 same host plant, and are probably both stages of a pyrenomycete. 



Brown Discoloration of Potato Leaves.f — J. Vanha has worked 

 out the attack and subsequent destruction of potato leaves by a fungus 

 which he describes under the name Sporidesmivm solani-varians. The 

 fungus can live as a saprophyte, but when it attacks the living host it 

 causes brown spots, which increase quickly and destroy the whole leaf. 



Disease of Figs. J — G. von Lagerheim finds that the fungus which 

 attacks figs is Sterigmatocystis Ficuum. It forms in the interior of' 

 the fruit small, black, dusty masses. Dates have also been attacked by 

 the same fungus. The author gives the growth properties of the spores 

 in different media. 



Diseases of Cacao.§ — Otto Appel and H. F. Strunk examined some 

 plants of Cacao from Victoria, Kamerun, that had been killed by some 

 obscure disease. On the branches they found a form of Diplodina, and, 

 on the fruit, species of fungi belonging to four different genera, all of' 

 which they consider to be new. The material with which they worked 

 was preserved in spirits or formalin. It could not certainly be stated 

 that these fungi were harmful to the plant. They have been described 

 by the writers for the information and help of Cacao planters and others. 



Handbook of Technical Mycology. || — F. Lafar, with the help of 

 forty-five other workers, is issuing a new and revised handbook. The 

 first part deals with the general history, anatomy and classification of 

 the Schizomycetes. It is written by Migula. The second part, by 

 Lindau, deals in a similar manner with the Eumycetes ; he discusses, 

 the form, membrane, plasma, nuclei, etc. 



Fungus Flora of Hearth-rug. f — C. Crossland and J. Needham 

 observed the different fungi that made their appearance on an old rug 

 made of jute, wool, and cotton. They noted seventeen species in all,, 

 which grew in succession on the cloth. Only two out of the seventeen 

 were humus species, the others had been observed commonly or exclu- 

 sively on similar habitats. One new species was determined, Libertella 



* Zeitschr. Zuckerind. in Bohnien, xxviii. (1904) p. 342. See also Centralbl. 

 Bakt., xiii. (1904) pp. 468-9. 



t Naturw. Zeitschr. Land und Forstw., 1904, p. 113. See also Centralbl. Bakt., 

 xii. (1904) pp. 321-2. 



X Separattrijck Svensk" Farmacoutisk Tidskr., 1903, No. 18, 6 pp. See also 

 Centralbl. Bakt.. xii. (1904) p. 466. 



§ Centralbl. Bakt., xi. (1904) pp. 551-7 (13 figs.). 



|| Handbuch der tecknischen Mykologie. Lief. i. (Jena, 1904). See also 13ot . 

 Centralbl., xcvi. (1904) pp. 354-5. f Naturalist, Dec. 1904, pp. 359-63. 



