480 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Uredineae.* — J. B. Dandeno supplies an account of experiments and 

 observations on Puccinia malvacearum . He finds that in the case of 

 this rust, which produces teleutospores alone, the reproduction of the 

 fungus in the following year is provided for by mallow plants that have 

 survived the winter and in which the mycelium is perennial. The theory 

 that the seed carries over the fungus was found to be incorrect, as also 

 the over-wintering of the teleutospores : none were induced to germinate 

 after a winter's duration. The mycelium of the fungus is intercellular, 

 though occasionally a haustorium is developed that penetrates a cell of 

 the host. 



Basidiomycetes. — M. Peltereau f publishes his studies and observa- 

 tions on Russula, a genus well defined and easily recognised, but the 

 species of which are difficult to diagnose. This is owing to the various 

 forms each species may assume and to the changing colours under 

 different conditions. The author takes them in groups and gives 

 characteristics of each. Incidentally he remarks that the mild forms 

 are all edible, some of them very good — and even some of the acrid 

 species may be eaten with impunity. 



F. Gueguen % gives his observations on some species of Lepiota. He 

 tested the rate of growth in L. lutea in the dark and in light, and found 

 they grew much larger in the dark. A small form allied to L. lutea was 

 named L. Boudieri. It is entirely sulphur-yellow coloured and grew in 

 hot-houses. 



A. Courtet§ reports some cases of poisoning by Tricholoma tigrinum. 

 It had been collected and eaten under the impression that all grey kinds, 

 such as Glitocybe nebularis, were harmless. Another case was due tc- 

 eating Amanita muscaria, it being mistaken for A. caisarea. Neither of 

 the cases proved fatal, though the symptoms of poisoning were severe. 



Ph. Guinier || and R. Maire give examples of the influence of 

 geotropism on the orientation of Ungulina fomentaria. A specimen was 

 found that had commenced growing on a standing tree in the usual 

 normal manner. Then the tree had fallen to the ground and a new 

 growth of the fungus had commenced, entirely covering the pores with 

 a hard tissue and forming a second fungus at right angles to the first. 



Contribution to our knowledge of Corticese.^f — Fr. v. Hohnel and 

 V. Litschauer contribute a study of this group based on the plants of 

 several important herbaria in Vienna, Geneva, and Berlin. They have 

 changed the genera of several species. Other species they have found 

 to be synonymous with those of earlier date. A diagnosis of the genus 

 Aleurodiscus is given, with a list of the species. The authors have 

 traced the development of JEgerita Candida : it never forms spores ; the 

 globose bodies are abnormal basidia of some Peniophora, and the fungus 

 must be known as P. JEgerita. Two new genera have been diagnosed : 



* Michigan Acad. Sci., Ninth Report, 1907, pp. 68-73 (5 figs.), 

 t Bull. Soc. Mycol. France, xxiv. (1908) pp. 95-120. 

 t Tom. cit. pp. 121-32 (3 figs.). § Tom. cit., pp. 133-7. 



|| Bull. Soc. Mycol. France, xxiv. (1908) pp. 138-40 (2 figs.). 

 i SB. k. Akad. Wiss. Wien. Math.-Nat. Kl., cxvi. Abt. 1 (1907) pp. 739-852 

 (4 pis., 20 figs.). See also Ann. Mycol., vi. (1908) pp. 73-7. 



