350 SUMMARY OF CURRENT RESEARCHES RELATING TO 



description of North American species of Marasmius, Nos. 124-162. 

 He gives diagnoses of all the species. 



Pocket Atlas of Fungi.* — P. Dumee has issued a pocket atlas of 

 edible and poisonous fungi. Popular descriptions are given of the 

 commoner species, their classification, distribution, etc. Information is 

 also given as to poisoning by fungi, and the best remedies in case of 

 such an accident. The atlas contains drawings of 64 species, printed in 

 colours and representing the fungi in their natural surroundings. 



Morphological Notes.f — F. Gueguen describes the structure and 

 development of Rhacodium cellare. He states that the filaments of the 

 fungus are verrucose ; that in cultures they anastomose and produce 

 sclerotia, and that upright hyphse form outgrowths resembling conidia. 



Mushroom Culture.:}: — Josef Steinert has succeeded in growing 

 mushrooms from spores. He sowed the spores on prepared manure ; 

 when the mycelium was evident it was transplanted to another hot-bed 

 and kept at an equal temperature. Finally a good crop of mushrooms 

 was raised. 



Studies in Myxomycetes.§ — E. Jahn continues his researches on 

 this subject, and gives us his observations on spore germination. In 

 the resting-spore of Ceratiomyxa he finds four nuclei ; the amoeba which 

 issues from the spore on germination divides into 2, then 4 and 8 small 

 bodies. In these latter the cilium is first formed and is connected with 

 the nucleus. In all other Myxomycetes the spores are uninucleate and 

 fall into two classes. In the first, the Reticularia type, the amoeba 

 remains for a short time in a resting stage and then forms a cilium. 

 In the Didymium type the cilium is already formed within the spore- 

 membrane. Jahn devotes special attention to the method of germination 

 and to the immediate causes of the bursting of the spore-membrane. 

 He found that he could hinder osmotic action in the spore and so retard 

 germination by increasing the concentration of the culture fluid. He 

 found also that the period of germination depends on the osmotic 

 pressure of the surrounding fluid. High temperatures hastened the 

 germination, especially of spores two years old. He verified Lister's 

 experience that only after moistening and again drying can certain spores 

 be induced to germinate. The bearing of these facts on the constitution 

 of the protoplast is discussed by the author ; he supposes that the 

 germinating activity is induced by an enzyme that forms glycogen from 

 maltose and which he terms glycogenose. The publication of further 

 results is promised. 



Abanzadi, D. Telesforo de— Catalago de Hongos observados en Catalnna. 

 (List of fungi from Catalania.) Lista de hongos del Empalme (Gerona) recibidos 

 en Noviembre de 1905. (List of fungi from Gerona received in November 1905.) 

 Segnnda lista de nombres catalanes de hongos. (Second list of Catalanian 

 fungi.) Bol. Hist. Nat., v. (1905) pp. 495-502. 



* Klincksieck (Paris, 1905) xiv. and 145 pp., 64 col. pis. 

 t Comptes Rendus, cxli. (1905) pp. 836-8. 



1 Wiener Illustr. Gartenzeit., heft 7 (1905) pp. 230-2. See also Bot. Centralbl., 

 ci. (1905) pp. 130-1. 



§ Ber. Deutsch. Bot. Ges., xxiii. (1906) pp. 489-97. 



