56 
OHIO BIOLOGICAL SURVEY 
EXPLANATION OF PLATE IV. 
Didymium squamulosum (A. & S.) Fr. 
Fig. 1. A single sporangium. X 20. 
Fig. la. A bit of capillitium. X 400. 
Fig. lb. A single spore. X 800. 
Fig. Ic. A number of crystals from the surface of spore. X 800. 
Didymium clavus (A. & S.) Rost. 
Fig. 2. A single sporangium. X 20. 
Didymium melanospermum (Pers.) Macbride. 
Fig. 3. A stalked and sessile sporangium. X 20. 
Mucilago spongiosa (Leysser) Morgan. 
Fig. 4. An aethalium. Natural size. 
Fig. 4a. Portion of an aethalium. X 10. 
Fig. 4b. A single spore. X 800. 
Fig. 4c. Crystals from surface of aethalium. X 800. 
Lepidoderma tigrinum (Schrad.) Rost. 
Fig. 5. A group of three sporangia. X 20. (Lister). 
Ceratiomyxa fruticulosa (Muell.) Macbride. 
Fig. 6. A group of sporophores. X 40. 
Fig. 6a. Tip of a sporophore. X 120. 
Fig. 6b. A single spore. X 800. 
