444 SUMMARY OF CURRENT RESEARCHES RELATING TO 



tion. He noted in connection with this rust that the mycelium was 

 rather scanty, but of very large dimensions. It fills the whole of the 

 intercellular spaces where it has penetrated. It is of a dense proto- 

 plasmic structure and contains numerous small bodies, which he con- 

 siders to be nuclei. These nuclei diminish in number as development 

 goes on. Klebahn draws attention to a special case he came across in 

 his examination of P. glumarum, which he considered to be somewhat 

 abnormal rust hyphfe, and which bear a strong resemblance to Eriksson's 

 mycoplasma. He points out the difficulty that Eriksson presents us, in 

 asking us to believe that nuclei appear spontaneously ; and he also 

 refers to the almost impossible task of detecting spots where uredo 

 pustules will appear, while as yet there is no visible trace of them. He 

 considers the question still unsettled. 



Rust of Cereals in Silesia.* — W. Eemer publishes a report on the 

 prevalence of rust diseases during the summer of 1003. He found 

 that the two species most frequently met with were Puccinia dispersa 

 TriUci and P. graminis Tritici. The rusts attacked the cereals in 

 greatest abundance in the localities where the ground had been richly 

 supplied with nitrogenous manure, either artificial or from the farm- 

 yard. The rich groAvth of the grass thus induced, seemed to afford a 

 more satisfactory condition for the parasite. Phosphates, especially 

 superphosphate of ammonia, seemed to be most effectual in checking 

 the spread of the rust. The presence of other fungus parasites rendered 

 the cereal still more liable to attack. The author did not find that the 

 rusts spread from the JEcidia of the alternate hosts, but he thinks that 

 the wild grasses of the woods and hedgerows act as intermediate hosts, 

 and to them the presence and continuance of the disease are largely due. 



Myxosporium, Myxolibertella and Sporodiniopsis.t — Franz v. 

 Hohnel points out that Myxosporium Tidasnei is identical with Septo- 

 myxa. He criticises Saccardo's action in sinking the form, genus 

 Myxolibertella (Melanconieae), which possesses two kinds of spores. 

 He insists also that the genus Sporodiniopsis should stand, as the fungus 

 described could not be placed under any of the existing genera without 

 a confusion of diagnoses. 



■&•• 



American Mycology. — A. P. Morgan % describes a new species of 

 Melogramma that grew on dead branches of Carpinus. T. D. A. 

 Cockerell § gives a short list of fungi collected by him in New Mexico.. 

 W. R. Dudley and C. H. Thompson || publish notes on Californian 

 Uredinete and descriptions of new species, of which there are three of 

 Puccinia and one of Uromyces.^ A descriptive list of Fascicle ix. of 

 Ohio fungi is given by W. A. Kellerman,** who also publishes notes om 

 species of Podosjrficera. He concludes that P. tridactyla is a true species 

 and not merely a variety of P. oxyacantlm as described by Salmon. 

 The author is led to the decision by the difference in form of the peri- 



* Zeitschr. Pflanzenkr., xiv. (1904) pp. 65-70. 



t Ann. Mycol., ii. (1904) pp. 247-9. 



X Journ. of Mycology, x. (1904) p. 49. 



§ Tom. cit , pp. 49-51. || Tom. cit., pp. 52-5. 



1" Tom. cit., pp. 55-62. ** Tom. cit., pp. 62-4 (1 pi). 



