474 SUMMARY OF CURRENT RESEARCHES RELATING TO 



there arise vertical branches ; these fork, and at the top of each fork a 

 two-celled spore is borne. Zahlbriickner names the fungus Lindauopsis 

 Caloplacce g. et sp. n., a Hyphomycete near the genus Didymaria in the 

 Mucedinacese-Hyalodidyrnae group. 



Uredinese. — Otto Schneider* has made a prolonged study of 

 Melampsora, the rust of willows. He records the results of 38 different 

 series of infection experiments, and has, in the course of his work, 

 established several new form-species. He finds a general morphological 

 resemblance between the different willow Melampsora, though bio- 

 logically they are widely different. 



Another series of experiments on rusts has been carried out by 

 Fr. Bubak,f extending over two years. He has proved that Uromyces 

 Poce forms an JEcidium on Ranunculus auricomas. He considers that 

 U. Poce may represent six or eight biological species. Uromyces 

 graminis on Melica ciliata has its JEcidium on Seseli glaucum. The 

 other experiments served to confirm results already obtained, or they 

 were without success. 



Rusts of Australia.! — D. McAlpine has published a book which 

 contains a record of all the rusts of Australia so far as they are known 

 at present. The first part of the work deals with the general aspect of 

 the subject, describing the fungi with their vegetative and reproductive 

 phenomena, and the different kinds of spores, with their probable origin 

 and development. The indigenous species are distinguished from those 

 that have been introduced ; they are mostly autcecious, and complete 

 their life history on one host-plant. Only four native species, so far, 

 have been found to be hetercecious. The author discusses the question 

 as to the method of infection and the spread of rust, and he also advises 

 as to the means of combating the disease. 



The second part of the book, from chapter xx. onwards, deals with 

 the classification of the fungi in the order Uredineae. The technical 

 terms are explained, and diagnoses are published of all the species, native 

 or introduced. 



Infection Phenomena in Uredinese.§ — I. B. Pole Evans describes, 

 the process of inoculation and infection by uredospores. The inocula- 

 tion stage includes the entrance of the germ-tube into the stoma, and 

 the swelling up of the tip to form the substomatal vesicle. Infection 

 has taken place when filaments grow out from the vesicle and form 

 haustoria in the cells of the host-plant. The substomatal vesicle varies 

 in form with the different species. 



Disease of Bamboo. || — S. Hori describes a smut of bamboo caused 

 by Ustilago Sbiriana P. Henn. It is produced on the growing points 

 and internodes of the young branches, causing often deformation or 

 distortion. The author recommends that the smutted branches should 



* Centralbl. Bakt., xvi. (1906) pp. 74-93 and 159-76. 



t Tom. cit., pp. 150-9. 



t Melbourne : R. S. Brain, 1906, vi. and 349 pp., 44 pis. 



§ Trans. Brit. Assoc, 1905, pp. 595-6. 



|| Bull. Imp. Agric. Exp. Station, i. (1905) pp. 73-89 (4 pis.). 



