ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 711 



regeneration. In the very young stages, changes as a result of wounduig 

 could not be observed ; a little later when the hymenium was fornaing, 

 an injury healed easily. When the hymenium was comparatively old, 

 regeneration was much slower, and finally failed altogether. 



Dry-rot.* — A. Moller has edited a pamphlet containing contribu- 

 tions by himself and others on the fungi that cause dry-rot. Richard 

 Falck, who takes the first paper, reviews the work already done on this 

 subject. C. Flugge discusses the supposed connection between dry-rot 

 and carcinoma in men and animals, giving results of various experiments, 

 and deciding that no direct connection has been proved, but indicating 

 that houses which harbour dry-rot owing to dampness and lack of 

 suitable ventilation are essentially unhealthy. Moller himself gives a 

 special account of Menilius lacrijmaiis, and Falck follows with a second 

 paper on the physiological conditions of growth of this and other fungi 

 that also destroy wood. The illustrations are from drawings and from 

 photographic reproductions in the field and from microscopic prepara- 

 tions. Three of the photographs are prepared as stereoscopic views. 



Plant Diseases. — John L. Sheldonj has examined the fungus that 

 causes leaf-tip blight of Dracena, which had been provisionally placed by 

 Halsted in the genus Gloeospormm. Sheldon gives a careful description 

 of the parasite, and concludes that it belongs to the genus Phijsalospora. 



A number of plant diseases are notified by the experts to the Board 

 of Agriculture. I Straw blight in wheat, due to Ophiobolus r/raminis, 

 causing the stalks to rot, was reported from Cambridgeshire ; diseased 

 oats were infected by Hehninthosporium teres ; white rust attacked 

 salsify plants ; mildews on apples, Euonynius and rose were treated. 

 A more lengthy description of apple-tree mildew, SpJucrotheca Mali, is 

 given ; it is very prevalent and more harmful to full-grown trees than 

 to nursery stock. Advice is given as to treatment. 



E. S. Salmon§ publishes an account of cherry-leaf scorch, due to the 

 fungus Gnomonia erythro stoma. He describes the fungus, its life- 

 history, and method of attacking the leaves, and gives his experience of 

 dealing with the evil. The method of plucking the diseased leaves has 

 been entirely successful where it has been thoroughly carried out, but as 

 it is a difficult and expensive operation, Salmon has been experimenting 

 with spraying Bordeaux mixture. He has found that very efficacious, 

 the disease yielding readily to such treatment. Certain varieties of 

 cherry-trees have been found to be immune to the disease, and though 

 the wild cherry becomes infected, it seems to be able to recover in the 

 course of a few seasons. 



J. Miyake|| found trees of Moras alba damaged l)y PhyUactmia 

 suffulta, and hj a species of Uncinula. He describes other fungoid 

 pests on apple, and also on tea plants. 



* Jena :■ Gustav Fischer (1907) iv. and 154 p^x (5 pis.). 

 + Journ. Mycol., xiii. (1907) pp. 138-40. 

 X Journ. Board Agric, xiv. (1907) pp. 358-60 (1 fig.). 

 '§ Tom. cit., pp. 334-41 (3 figs.). 



II Bot. Mag. Tokyo, xxi. (1907) pp. 1-6 and 36-44 (1 fig.). See also Ann Mycol., 

 V. (1907) pp. 295-6. 



