ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 587 



Fungi on Juncaceae.* — E. Lenmiermann has classified all the fungi 

 — a very large number — that are to be found growing on species of 

 Juncaceae. They belong to the Phycornycetes (1), Ascomycetes (140), 

 TJstilagineae (IS), Uredineae (12), and to the Fungi imperfecti (00). 



Notes on American Fungi.f — Ernst A. Bessey describes carefully 

 the fungus Dilophospora Alopecuri which he found on grass leaves. He 

 gives an historical account of the fungus since its discovery by Fries. 

 J. R. Sumstine % records a new American species of Pleurotus, distin- 

 guished by a thick tomentum ; he also describes a form of Wynaea 

 americana that differs somewhat from Thaxter's specimens. 



American Gooseberry Mildew in Europe.§ — Jakob Eriksson 

 records the different outbreaks of this fungus in widely different 

 localities since it was first observed in Ireland in 1900. He gives in- 

 stances of the way in which the fungus has spread from some central 

 mursery and from imported plants. He recommends that all plants 

 .attacked should be at once destroyed, that careful watch should be kept 

 in all nurseries where gooseberry plants are cultivated, and that the im- 

 portation of these plants from other countries should be prohibited. 

 The spread of the disease is becoming somewhat alarming. 



Plant Diseases. — A. de Jaczewski || writes on two forms of disease 

 of gooseberries in Russia, not hitherto recorded. The one forming 

 brown spots on the fruit was due to the hyphomycetous fungus 

 AUernaria Grossularm sp. n. The fruits attacked dropped without 

 ripening. The other fungoid attack caused the fruits to rot, owing to 

 the penetration of the mycelium into the tissue of the berry. The 

 fungus was diagnosed to be one of the Melanconieae, Colletotrichum 

 Grossularm sp. n. 



A preliminary notelf on root disease of sugar cane is published by 

 L. Lewton Brain. The fungus infests the growing point of the roots 

 and interferes with the water supply. It is suggested that it may be 

 related to Marasmius Saccharl. 



J. Beauverie** contributes a paper on the disease of plane trees, caused 

 by Glwosporium nervisequum. The cold spring has encouraged the 

 growth of the fungus, and the planes in the Lyonnais are in a lament- 

 able condition. The disease was confined at first to the leaves ; in a later 

 season it attacked the young branches, then the larger branches were 

 invaded, and whole trees have been destroyed. The disease was checked 

 for a year or two by the more favourable climatic conditions, but it has 

 again become virulent. Beauverie recommends cutting off the branches 

 attacked, spraying and powdering young trees not yet attacked, covering 

 wounds by some antiseptic, and instead of propagation by cuttings, 

 saving seed and cultivating new individuals. 



* Abh. Naturf. Ver. Bremen, xviii. (1906) beft 2, pp. 465-89. See also Bot. 

 Centralbl., ci. (1906) pp. 632-3. 



t Journ. Mycol., xii. (1906) pp. 57-8 (1 fig.). { Tom. cit., p. 59. 



§ Zeitscbr. Pflanzenkr., xvi. (1906) pp. 83-90 (2 pis.). 



|| Bull. Soc. Mycol. France, xxii. (1906) pp. 121-4 (2 figs.). 



•jf Exper. Stat. Hawaiian Sugar Planters' Association, Bull. No. 2, 1905. See 

 also Bet. Centralbl., ci. (1906) p. 649. 



** Comptes Bendus, cxlii. (1906) pp. 1551-4. 



2 Q 2 



