ZOOLOGY AND BOTANY, MICROSCOI'V, ETC. 83 



development, since the developmental stimulus under certain conditions 

 can be effected by other agencies. AVager gives special attention to 

 sexuality in Ascomyeetes, where there may be well-ditferentiated sexual 

 organs with nuclear fusion, and again a nuclear fusion in the ascus. The 

 latter fusion is always present. He discusses the significance of nuclear 

 fusion and its importance in the life-history of the organism. A. L. S. 



Experimental Research on Red Mildew Fungi. — F. ^y. Negkr 

 (Flora, 11)17, 110, 67-131), :il ligs. ; see also Hedwif/ia, 1918, 60, 

 Beiblatt, 20-80). It is a mistake, according to the author, to conclude 

 that only one species enters into the dark brown felt on leaves that 

 constitutes the above fungus. Only culture experiments will enable the 

 mycologist to differentiate the various forms. By sowing spores of 

 Bulgaria pohjmorpha, Herpotrichia tiajra, Xylaria Hypoxylon, etc., in 

 concentrated sugar solutions he was able to produce growths identical 

 with the red mildew forms. A. L. S. 



Fung'us Flora of Hevea braziliensis. — T. F. Chipp {Gardens' 

 Bulletin, ^Straits /Settlements, 11)20, 2, l.SG-92). The paper was prepared 

 in answer to enquiries as to the fungus diseases of Hevea. The long list 

 is grouped according to the respective habitats of the fungi — on root and 

 collar, stem and branches, etc. — and contains the names, with notes, of 

 all fungi that have been found on the tree in Malaya. A. L. S. 



Mycological Contributions : I. Ascomyceten. — C. van Overeen 

 {Hedivigia, 1920, 61, 383-9, 2 figs.). The author adds notes to the 

 previously published descriptions of several fungi, as, for instance, in 

 Gorgoniceps aridula, in which he found the spores formed in a fascicle ; 

 they varied from single to Ifi-septate, and were all equally capable of 

 germination. Helotium pallescens is also described, and the conidial 

 stage, Rutsbrcemia firma,. is described and figured. Other Discomycetes 

 are reviewed. In another paper on Fungi Imperfecti (pp. 375-79, 1 fig., 

 1 pi.) Overeen gives an account of two little-known parasites of 

 Discomycetes, Stephanoma strigosuni and S^pedonium simplex, both of 

 which grow on Lachnea liemisptiserira and other Pezizae. A. li. S. 



Hypomyces on Lactarius. — A. Lingelshelm {Hedirigia, 1920, 61, 

 380-2). The author describes a new species, Verticillium silesiarum, 

 which grew on Lactarius the/ogola. He discusses the relation of this 

 fungus with Hgpomyces lateritius. A. L. S. 



New or Rare Microfungi. — A. Lorrain Smith and J. Ramsbottom 

 (Trans. Brit. Mycol. Hoc, 1920, 6, pt. 4, 365-76). A long list of species 

 new' to Britain have been determined and published ; a few are new 

 species ; two genera have been added to the British Flora. Many of the 

 fungi listed are minute parasites on the higher plants. A. L. S. 



Host Index of Fungi of the Malay Peninsula.- T. F. Chipp 

 (Gardens' Bulletin, Straits Settlements, 1920, 2, 231-8, 276-82). The 

 host plants are listed alphabetically, and the fungi include not only 

 the known parasites wliich cause disease, but all those that have been 



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