SUMMARY: Calcium is required by for the normal formation of perithecia, but is not essential for vegetative growth. Calcium is at least partly replaceable by scrontium or barium. Most of the other species of tested responded to calcium, either in fruiting or growth, or both.

Suitable doses of calcium reproduce in a large measure the previously observed effect of jute extract on the fruiting of species. The presence of calcium in jute extract was established.


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