Allomyces is a water mold which is widely distributed throughout the world and particularly abundant in warmer climates. This fungus exhibits true alternation of generations. A diploid filamentous sporothallus produces spores and a haploid filamentous gametothalls produces gametes.
A. Vegetative hyphae. B. Meiosporangia. C. Mitosporangium. D. Release of mitospores. E. Meiosporangium. F. Sexual phase: male gametangia terminal, the female just below each. G. Male and female gametangia; note exit papillae. (Bold, 1987)
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