A CULTURAL STUDY OF SEXUALITY IN SIROGONIUM MELANOSPORUM

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Abstract
SUMMARY: The chlorophytan alga, Sirogonium melanosporum, is a member of the Zygnemataceae and superficially resembles certain species of Spirogyra. Clonal cultures of S. melanosporum were isolated from a natural collection obtained near Guaymas, Mexico. In Pringshei?n's soil‐water medium with a light intensity of 3,500 lux at 22 ± 2 C, cultures of the alga produce a netlike growth which results from the genuflexion of filaments and the onset of the sexual process. The clones studied are homothallic with a totally anisogamous mode of reproduction. The major events of the sexual cycle, including gametangial development, gametic formation, syngamy, and the germination of zygospores, were observed for S. melanosporum and compared with an early account of sexual reproduction in S. sticticum.

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