ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 389 



top" of June grass, Poa pratensis, are due to the same fungus, which in 

 both cases is associated with a mite. Inoculations were made on healthy 

 carnation buds, and thirty-six of these were successful, the buds 

 becoming diseased and covered with the fungus. A description of the 

 mite is also given. It was not present on the experimental buds, and 

 was occasionally absent from diseased grass heads, but as a rule it is 

 present and probably helps largely in disseminating spores. There was 

 not sufficient evidence to prove that the mite fed on the fungus spores. 



Ewert * reports the first appearance in Germany of Septoria Azalese, 

 a fungus that attacks the leaves and buds of Azaleas and causes them 

 to die off prematurely. The disease is reported from Silesia. 



R. Laubert t has examined the mildew of apple trees as to the proper 

 determination of which there was some doubt. He fortunately found a 

 good development of perithecia, and was able to assign it to its proper 

 position as Podosplisera leucotricha. He recommends the careful pruning 

 and destroying of all twigs attacked, and powdering the trees with 

 sulphur or spraying with sulphur solutions. 



P. Magnus} describes some parasitic fungi from the Argentine. 

 Albugo Candida, very common in Europe, has probably been taken 

 across the ocean with cruciferous plants. The author discusses other 

 species of the genus that also occur in South America. Roestelia inter- 

 veniens, found on Malvastrum tenellum, is also described, and another 

 ajcidum form, A. Kurtzii Fridericisp. n., on the under side of leaves 

 of Gmtiana sp. ; the other spore forms have not been detected. 



Th. AVulff § describes some diseases of Ribes due to Botrytis. On 

 R. aureum a species of the fungus settled in wounds of the branches 

 and thence passed to healthy shoots. Another attack by Botrytis is 

 recorded on the leaves of R. rubrum and R. grossularia. The spores 

 had germinated in the drops from water-stomata and had penetrated 

 and killed the leaves. 



H. Morstatt|| describes the ravages of GJccosporium fagicolum on 

 beech-trees in the Island of Rugen. The diseased leaves fall early and 

 the trees are left bare. The higher fruit form has not yet been discovered. 



F. L. Stevens and J. G. Hall f describe a hypochnose of Pomaceous 

 fruits— a leaf-blight of apple, pear, and quince — in the United States. 

 The disease shows roundish sclerotia on the twigs and rhizomorphic struc- 

 tures like ribbons which pass along the twigs and form on the under 

 side of the leaves a felt of mycelium. The authors refer the fungus to 

 Hypochnus ochroleucus. It is superficial on leaves and twigs, and might 

 be removed by spraying in spring when growth begins. 



Hiltner ** publishes notes on the rolling of potato leaves due to the 

 fungus Fusariam. He denies that the colouring of the bundle system 



* Zeitschr. Pflanzenkr., xviii. (1908), Beigabe 4, p. 121. 



t Deutsch. Landw. Presse, xxxv. (1908) pp. 628-9 (3 figs.). See also Bot. 

 Centralbl., ex. (1909) p. 41. 



% Hedwigia, xlviii. (1908) pp. 147-51 (5 figs.). 



§ Ark. Bot., viii. No. 2 (1908). See also Bot. Centralbl., ex. (1909) p. 148. 



|| Arm. Mvcol., viii. (1909) pp. 45-8 (2 figs.). 



t Tom. cit., pp. 49-59 (8 figs.). 



** Prakt. Bl. Pflanzenb. Pflanzeusch., vi. (1908) pp. 25-30. See also Ann. 

 Mycol., vii. (1909) p. 83. 



