Achyla ambisexualis

One of the most common of water molds.

Sexual reproduction is governed by a complex system of sex hormones. Oogoniol, secreted by the male thallus induces development of oogonia in the female thallus. Antheridiol, produced by the female thallus, induces formation of antheridial branches in the male thallus. (Frames from a video clip. Courtesy of R.H. Woodworth Science Films.)

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