SPORE EXPULSION AMONG PHYCOMYCETES 



181 



giophore occasioned by air currents or increased temperature 

 causes the crown of the little tree to twirl and twist. In conse- 



Fig. 28. Discharges of spores by various Phycomycetes. A. Olpidium 

 brassicae. B, C, D, E. Physoderma maydis. F, G. Lagenidium rabenhorstii. 

 H, 1, J. Saprolegnia sp. K, L, M. Pythium de Baryamnn. O, P, Q, R. 



Albugo Candida. 



quence of these hygroscopic movements the sporangia are dis- 

 lodged [Pinckard (1942)]. Long ago attention was called to 

 this phenomenon by de Bary (1887), who stated from his ob- 



