Culture of Verticillium albo-atrum , B. et Br. 
539 
References. 
1. Coons, O. H.: Factors involved in Growth and Pycnidium Formation of Plenodorims rufo - 
maculans. Journ. Agric. Research, vol. v, p. 713, 1916. 
2 . Edson, H. A., and Shapovalov, M. : Temperature Relation of Potato-rot Fungi. Ibid., 
vol. viii, p. 720, 1920. 
3. Munk, M.: Weitere Untersuchungen fiber die Hexenringbildung bei Schimmelpilzen. Biolog. 
Centr., 1914, vol. xxxiv, pp. 621-41. 
4 . Moreau, F. : Sur les zones concentriques que forment dans les cultures les spores de Pencillium 
glaucum. Bull. Soc. de France, vol. lix, pp. 471-5, 1912. 
5. Hedgecock, G. G. : Zonation in Artificial Culture of Cephalothecium and other Fungi. Report, 
Missouri Bot. Gard., 1906, pp. 115-17. 
6. Knischewsky, O : Tagesringe bei Penicillium luteum. Landw. Jahrb., 1909, Erganz.-Bd. v, 
PP- 34 T " 3 - 
7. Munk, M. : Bedingungen der Hexenringbildung bei Schimmelpilzen. Centr. f. Bakt., Abt. ii, 
PP- 32 , 353 ) 75 , I 9 12 - 
