ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 309 



tinction from other allied fuiig-i. The fuugus measured up to G5 mm. 

 from the base of the arms to their tips; the " foot " varied in size, the 

 largest recorded being 60 x 25 mm. A. L. S. 



AgaricaceBB of Michigan.— C. H. Kaufpman {Michiqan Geol. and 

 Biol. Surveij, Publ. 2G, Biol. Ser. 5, 1918, 1924 pp., 2,172 pis.). The 

 first volume, containing the text, gives a very detailed account of gilled 

 fungi ; a general account of the group, instructions for collection and 

 examination ; a complete classification with keys to genera and species ; 

 a chapter on mushroom poisoning ; finally, a bibliography, glossary and 

 index. The plates, which form the second volume, are photographic 

 illustrations of a representative series of plants. A. L. S. 



Mycetes Boreali-Americani.— P. A. Sacoardo {Niwvo Giorn. Bot. 

 ItaU 1920, 27, 7.V98). The fungi were sent by Dr. J. R. Weir, of 

 Spokane, Washington, to Saccardo, and the work was completed in 1919, 

 though now published posthumously. The list of 98 species, a number 

 of them new to science, includes only two Basidiomycetes and one 

 Mycetozoon, the others belong to Uredineag, Ascomycetes and Fungi 

 Imperfecti, all of them more or less microfungi. A. L. S. 



Heterothallism and Similar Phenomena. — E. M. Cutting {Neiv 

 Phytologist, 1921, 20, 10-16). The author of this paper gives an im- 

 portant summary on the behaviour of varying strains of mycelia as 

 represented in researches on very different fungi. He cites Burgeff' s 

 work on Phycomyces nitens, where neutral strains were secured from 

 spores formed after grafting a + and a — mycelium. The sporangia 

 formed contained + and - as well as neutral spores. Work on 

 Zygorhyncus by several authors is quoted. Atkinson considers that this 

 fungus is a lowly form of Ascomycete. In Glomerella, an Ascomycete, 

 the conjunction of difPerent mycelia produces an increased number 

 of ascocarps. Work on Oomycetes and on Basidiomycetes is also 

 described and criticized. A full bibliography of papers dealing with 

 the subject is given. A. L. S. 



Mycological Studies. I. On the " Spotting '" of Apples in Great 

 Britain.— Arthur S. Horne and Eleanor Violet Horne (^Ann. 

 Appl Biol, 1920, 7, 183-201, 6 figs.). The authors give a sketch of 

 work done on this subject by students in America, the causal agents of 

 spotting including a considerable number of fungi. They record and 

 describe the various fungi formed on spots in this country. These 

 include a new genus of Phormatales {Polyopeus) and nine new species, 

 one of which, Ploospora pomorum, is capable of parasitizing apples. None 

 of the fungi recorded on apple spots in America were found on British 

 apples. A. L. 8. 



Spotting in Apples.— A. S. Horne and E. V. Horne {Gard. 

 Chronicle, 1920, 68, 216-7, 4 figs.). The authors give an account of 

 the spotting, of the fungi that cause the trouble, the districts affected 

 and the varieties of apple that have been affected. They consider that 

 the fungi attack the apples through the lenticels, and after gaining an 

 entrance they follow the air-spaces and hinder respiration. The sur- 



