A developmental study with the SEM of sexual reproduction inChytriomyces hyalinus

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Abstract
Results of a developmental study of sexual reproduction in C. hyalinus Karling with the scanning electron microscope [SEM] are similar to those obtained from a previous study with the light microscope. Sexual reproduction is initiated by rhizoidal anastomosis of 2 contributing thalli. The contents of these contributing thalli flow to the point of rhizoidal anastomosis, forming there the incipient resting body in which nuclear fusion occurs. SEM observations and culture experiments indicate that resting bodies are not produced from single thalli (asexually) but require 2 contributing thalli. Rhizoidal fusion appears to be initiated by a depletion of nutrients and not by the accumulation of a substance controlling sexual reproduction.