212 SUMMARY OF CURRENT RESEARCHES RELATING TO 



the spore. Petri considers that the definitive nuclei of the mature spore 

 are derived from the division of a pseudonucleus formed from the 

 chromatic granules. The spore figured by the author has three nuclei. 



Adventitious Growths in Fungi.* — F. Gueguen has studied the 

 various cases among the higher fungi where an additional hymenium 

 has been formed. He concludes that the malformation is caused by 

 some external interference ; it may be some foreign body in contact 

 with the pileus during growth that prevents the growth of the external 

 layer, and so induces the formation of a hymenium. 



Italian Agaricacese.f — Matteo Lanzi has published from time to> 

 time descriptions of the larger fungi from the neighbourhood of Rome. 

 A number of the parts have come recently to hand, published at intervals 

 from 1888 to 18 ( ,)4. They deal with white, pink, brown, and purple- 

 spored forms. The species are very fully described and a number of 

 coloured plates accompany the text. 



Boletus Briosianum sp. n. X — Rodolfo Farneti gives a careful 

 macroscopical and microscopical description of this new hymenomycete 

 found near Padua. He directs special attention to the chlamydospores 

 which resemble teleutospores in form. The anatomy of the fungus is 

 worked out in detail and a water-conducting tissue is described — a 

 phenomenon not hitherto noted. This species of Boletus comes under 

 the section subtomentosi. 



Study of Fungi.§ — M. Barbier publishes some notes on the methods 

 he has found useful in determining fungi. He makes a tracing of the 

 section of any large fungus and colours the different parts. In examining 

 the spores microscopically he advises the student to make them move, as 

 only by so doing can he determine their exact form. 



Value of Spore Characters. || — Matteo Lanzi concludes from his 

 observation and experience that the colour and form of fungus spores 

 are of great value in the determination of species. Size is of less 

 importance as there may be considerable variation in dimension. 



Poisoning by Fungi.1T— L. Rolland inquired into a serious case of 

 illness and death caused by eating fungi. A number of species had 

 been cooked and eaten by the victims, and Rolland was able to identify 

 several species of Amanita as the origin of the mischief and especially 

 A. mappa. Another case of poisoning he also examined had probably 

 been due to a species of Lactarhis, but the plants could not be accu- 

 rately determined from the descriptions given. 



L. Lutz ** gives an account of an exhibition of edible and poisonous 

 species at Aix-en-Uthe, and J. Offner ft explains the system of inspection 

 that prevails at Grenoble, where a large number of fungi are exposed for 

 sale in the market. 



* Bull. Soc. Myc. de France, xviii. (1902) pp. 305-11 (1 pi.), 

 f Atti Ace. Pontif. Nuov. Lincei, 1888-1894, pp. 87-196 (6 pis ). 

 j Atti 1st. But. Univ. Pavia, vii. (1902) pp. 65-82 (3 pis.). 

 § Bull. Soc. Myc. de France, xviii. (1902) pp. 413-6. 

 || Atti Ace. Pontif. Nuov. Lincei, li. (1898) pp. 4. 

 ' «f Bull. Soc. Myc. de France, xviii. (1902) pp. 417-22. 



** Tom. cit., pp. 423-4. ft Tom. cit., pp. 425-6. 



