Abstract
SUMMARY1. Zonation in Allomyces arbuscula, represents a periodic massing of hyphae and reproductive structures.2. Under the conditions ordinarily obtaining in the laboratory, there is a diurnal rhythm in zonation, a heavy ring being laid down between 6+ A.M. and 12+ P.M., a diffuse one between 12+ P.M. and 6+ A.M.3. Diurnal illumination shows no apparent causal relationship with ring growth.4. Growth rings are caused by diurnal fluctuations in temperature.5. A fluctuation between ½° and 1½° C. is enough to cause growth ring formation.6. The knowledge that fungus mycelia may be extremely sensitive to temperature changes suggests that temperature may exert a more profound influence on zonation than has been assumed.
Published Version
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