ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 205 



the seedling plants. Oats are also attacked by other forms of 

 Helminthosporium. 



Gummosis and canker of fruit-trees are due, the latter to wound 

 infections, the former to a variety of causes that are best met by pro- 

 viding more nourishment for the tree. 



Kock * describes the injury done to roses by the fungus Coniothyrium 

 Fuckelii. It is found on the young shoots. Fungicides are recom- 

 mended. 



An epidemic disease of tomatoes was found by V. Oven j to be caused 

 by a new and variable species, Fusarium erubescens. It increases by 

 micro- and macrogonidia, by chlamydospores and by sclerotia, and 

 attacks ripe and unripe fruits, gaining entrance by wounds. 



H. GussowJ has examined the disease of cucumbers first reported 

 and described by Cooke and Massee as due to Cercospora Melonis. He 

 has decided that the fungus is not a Cercospora, and he gives it the name 

 of Corynespora Mazei g. et sp. n. He gives reasons why he has not 

 placed it in Polydesmus, and why he has given it a new specific name. 

 He also describes the germination of the spores in artificial cultures. 



Harold H. Hume § describes an anthracnosis of the Pomelo (bitter 

 orange) the leaves and fruit show brown spots on which the fruits of 

 Colletotriclium are developed. The fruit is attacked on the tree or 

 after it is gathered, and the flavour is spoiled. 



A disease of potatoes has been determined by G. Lagerheim and 

 G. Wagner to be due to Cercospora concors. It causes spots on the 

 leaves, which increase till the greater part of the leaf is destroyed. 

 Description of the fungus is given, and remedies suggested. 



Witches' Brooms. || — E. Heinricher failed to reproduce witches' 

 brooms on cherry-trees by inoculation with spores of the fungus 

 Exoascus Cerasi, but he succeeded in grafting a "broom" from a 

 diseased tree to a healthy one. 



In a second paper ^ he describes a very large " broom " on Prunus 

 Padus. He was unable to account for its growth, as no trace of the 

 fungus could be detected in the leaves. 



Fungus Spores in the Atmosphere.** — K. Saito placed dishes 

 containing nutrient gelatin in many localities to test the presence of 

 floating fungus spores. He found that they varied considerably accord- 

 ing to the weather — wind, rain or temperature. In the heat of summer, 

 Botrytis cinerea and Verticillium glaucum appeared most frequently ; in 

 colder weather species of Heterobotrys and Fusarium roseum. At 

 average times the most frequent were Penicillium glaucum, Cladosporium 



* Zeitschr. Land. Versuch. Oesterr., 1905, heft 7. See also Centralbl. Bakt., 

 xv. (1905) pp. 489-90. 



t Land. Jahrb., 1905, heft 3-4. See also Centralbl. Bakt., xv. (1905) pp. 491-2. 



j Zeitschr. Pflanzenkr., xvi. (1906) pp. 10-13 (5 figs.). 



§ Bull. Florida Agric. Exper. Station, No. 74, Jackonsville, 1904 (4 pis.). See 

 also Zeitschr. Pflanzenkr., xvi. (1906) pp. 52-3. 



|| Nat. Zeit. Land. Forstw., iii. (1905) pp. 334-8. See also Ann. Mycol., iii. 

 (1905) p. 483. 



% Tom. cit., p. 348. See also Ann. Mycol., iii. (1905) p. 483. 

 ** Journ. Coll. Sci. Tokyo, xiii. (1904) pp. 1-53. See also Centralbl. Bakt., xv. 

 (1905) p. 266. 



