622 SUMMARY OF CURRENT RESEARCHES RELATING TO 



trichum, and Cristularia. The Verticillieae follow next in order. The 

 genus Pachybasium, with three species, is described, and several of the 

 species of Verticillium. The genera are illustrated in the text.* In 

 the succeeding part the Verticillieas are concluded, and the Gonato- 

 botrytidea3. The group Hyalodidyrnese, with colourless 2-celled spores, 

 is commenced. It is satisfactory to note that Lindau sinks Gephalo- 

 thecium, a genus similar to Trichothecium. 



Cercospora beticola parasitic on Sugar and Fodder Beet.f — J. Uzel 

 describes this disease, which makes itself known by grey or brown spots 

 on the leaves. Infection takes place through the stomata ; the mycelium 

 burrows in the intercellular spaces, finally penetrating the cells. The 

 conidiophores pass out again through other stomata. The conidia are 

 terminal : after the first one falls, a second is produced a little lower 

 on the stalk, which in turn becomes terminal. The conidia winter in 

 the soil on the decaying leaves. 



North American Uredinese.J — E. W. D. Holway has issued Part I. of 

 a projected comprehensive account of Uredinese. He gives a short 

 account of Puccinia, and then gives detailed diagnoses of the different 

 species, grouping them under the various natural orders, genera, and 

 species of host plants. Those described all grow on the western con- 

 tinent. The spores are illustrated by photomicrographs. 



Mexican Rusts. § — J. C. Arthur publishes a list of Rusts on Legu- 

 niinosas, many of them new, from material collected in Mexico by 

 E. TV. D. Holway. The genera Ravenelia and Uropyxis are specially 

 well represented. He describes a new genus Calliospora with three 

 species. The teleutospores alone have been seen. They have two 

 lateral germ pores in each of the two cells of the spore. 



Genus Cortinarius.|| — Calvin H. Kauffman publishes a preliminary 

 study of this the largest genus of the Agaricacese. He follows the 

 example of Fries in the subdivisions, but he thinks that these sub- 

 genera proposed by Fries are distinct enough to be reckoned as genera. 

 All the Gortinarii are distinguished by the brown spores and the cobweb- 

 like veil or cortina. Many of them are brightly coloured, but as 

 they tend to fade quickly that is not a good diagnostic character. The 

 shape of the spores he considers to be more useful in determining species. 

 Kauffman gives an account of the general habitat of these plants, and 

 advises the beginner as to the points to be examined and noted. A 

 key of the American species is given, and diagnoses of several new 

 species. 



Mycological Notes. IT — C. G. Lloyd has just issued No. 19 of his 

 notes, dealing principally with the genus Lycoperdon. He publishes 



* Rabenhorst's Kryptogamen Flora, Band i. Abt. 8, Lief. 97 (Leipzig, 1905) 

 pp. 321-64. 



t Prague (1904) 16 pp., 2 pis. See also Bot. Centralbl., xcviii. (1905) pp. 602-3. 



% North American UredinesB, i. Part 1 (Minneapolis, 1905) 32 pp. (10 pis.). 



§ Bot. Gazette, xxxix. (1905) pp. 385-96. 



|| Bull. Torrey Bot. Club., xxxii. (1905) pp. 301-25. 



f Cincinnati, May 1905, pp. 205-20 (14 pis.). 



