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Summary
Thirty-five fungi classified in the Phycomycetes, Ascomycetes, Deuteromycetes, and Basidiomycetes were used in this study as potential hosts for Dimargaris verticillata. Stimulation of growth of D. verticillata regularly occurred in the presence of each of the 23 Mucorales tested but not in the presence of fungi of other taxonomic groups. Parasitism by D. verticillata, based on normal sporophore formation, occurred on 18 fungi representing 13 genera of Mucorales. Six Mucorales and 11 fungi outside this order were not parasitized under the conditions used.
Colony formation of D. verticillata on its hosts was generally limited to the area of parasite inoculation suggesting that the age of the host hyphae is a factor affecting parasitism. Spreading growth of the parasite did occur on three host fungi.
No tropic response was observed between D. verticillata and its reference host, Cokeromyces recurvatus.