BUCHEIM: Zur Biologie von Melampsora lini Sond. Ber. d

Deutsch. Bot. ges. Bd. 33, 1915.

BUISMANN C. J.: Root rots caused by Phycomycetes. 1927, Med. Phytopath. Lab. «Willie Commelin Scholten»,

27. BUTLER E. J.: An account of the genus Pythium and some Chy-

tridiaceae. 1907, Mem. Dept. of. agric. in India, Botan. Series, Vol. 1.

28. CHARLES and JANKINS: A fungus disease of hanf. Journ. of agr. res. III. 1914.

29. DANGEARD P.: Recherches sur les organismes inférieurs. 1886.

30. DELACROIX-MAUBLANC: Maladies parasitaires des plantes cultivées. Paris 1916.