68 
OHIO BIOLOGICAL SURVEY 
EXPLANATION OF PLATE X. 
Fig. 1. Spore of Lycogala epidendrum (L.) Fr. 
Fig. 2. Amoeba like swarm spore of same. 
Fig. 3. Zoospore showing flagellum. 
Figs. 4, 4a, and 4b. A small portion of the plasmodiumof Hemitrichia clavata (Pers.) 
Rost, sketched at intervals of five minutes, showing how rapidly changes in 
outline are produced by the creeping movement of the plasmodium (X40). 
Fig. 5. Diagrammatic sketch of a sporangium. A, stalk; B, hypothallus; C, columella; 
D, sporangium wall. 
Fig. 6. After Lotsy. Plant attacked by Plasmodiophora brassicae Woronin showing 
the club root effect. 
Fig. 6a. After Lotsy. Cells of the host filled with the spores of P. brassicae Wor. 
Fig. 7. Sketch of a mass of cells of Dictyostelium sp. (diagrammatic). In 7a the 
central cells are forming a stalk upon which the remaining cells creep and 
form a mass of spores as in 7b. 
