ZOOLOGY AND BOTANY, MICROSCOPY. ETC. 347 



rare, having been found only a few times. Xo specimens of such com- 

 mon forms as Marasmius oreades, Russula emetka, or Amanita niuscaria 

 were found. Cortiniarius was rare until 1905. Careful spore measure- 

 ments are given, all of them taken by the author. The date and locality 

 of each collection are also given. A number of Mycetozoa are included 

 in the list. 



Fungi in Denmark.* — F. Kolpin Ravn made a series of observations 

 of plant diseases on the islands in the Cattegat. They corresponded 

 usually with those of the neighbouring mainland. Puccinia graminis 

 was frequently met with, although Berberis did not grow on the island. 

 Another species, P. cerenifera, was observed, its tecidial host Rhammis 

 cathartica also being absent. 



L. K. Rosenvingef describes a marine fungus parasitic on Cliondrus 

 crispus which he names Leptosphceria Chondri. The cystocarps and 

 tetrasporangial sori alone were attacked. He also notes the occurrence 

 of some subterranean fungi and of Geaster triplex ; these are all recorded 

 from Denmark or Xorth Cattegat coasts. 



^s^'- 



Classification of Fungi. | — P. A. Saccardo and Gr. B. Traverse give 

 an outline of the scheme of arrangement adopted for this group of 

 Cryptogams in the Flora Italica Cryptogama. They do not claim 

 finality for their scheme, as the knowledge of many of the groups and 

 forms is still very imperfect. They have aimed at a system that repre- 

 sents present day scientific attainments, and that is also simple and 

 practical. They recognise three great divisions : Eumycet^, including 

 Teleomycetae and Deuteromycetge ; Myxomycetae ; and Schizomycetse. 

 Each subdivision contains Classes : Basidiomycetee, Ascomycette, etc., 

 and, below these, the Orders ending in 'ales,' such as Hymeniales, 

 Oasterales, etc., which are again divided into families, Agaricacea3, 

 Polyporacese, etc. 



Some Elements of Plant Pathology. § — U. A. Cobb has issued 

 under the above title a pamphlet of instructions on plant diseases to 

 planters, especially of sugar-cane. He informs them of the nature and 

 structure of both hosts and fungal parasites. He explains the reasons 

 why prolonged cultivation of plants without any pause makes them 

 peculiarly liable to attack, and he describes the way in which the fungus 

 gains entrance to and destroys the tissues of the host. Advice is given 

 .as to the use of fungicides and the selection of disease-proof varieties. 



Self-heating of Hay.|l — It has long been known or surmised that 

 the self-heating of hay was due to bacteriological action. Hugo Miehe 

 has published a treatise on the subject, giving an account of the various 

 experiments whereby he has proved that the heating is due to physio- 

 logical action alone. He has also isolated and cultivated the micro- 



* Tids. Landbr. PlanteavL, xiii. (1906) pp. 116-24. See also Bot. Centralbl., 

 civ. (I'JOT) pp. 257-8. 



t Bot. Tidssk., xxvii. heft 2 (1906) pp. 33-6. See also Bot. Centralbl., civ. 

 (1907) pp. 258. X Bull. Soc. Bot. Ital., 1907, pp. 22-8. 



§ Rep. Exp. Stat. Hawaiian Planters' Assoc. Honolulu, 1903, 45 pp. (2 figs.). 



ll Die Selbsterhitzung des Hens. Jena : Gastave Fischer (1907) 127 pp. (11 tigs.) 



2 A 2 



