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SUMMARY
Growth of Cyathus helenae occurred within a pH range of 5–7. Greatest growth was recorded when only 8–10 hr of light were supplied. Blue and red light reduced the growth of C. helenae. Zinc had a stimulatory effect; slight inhibition of growth occurred in the presence of copper, iron, and manganese. Glucose and maltose were utilized by C. helenae almost equally well; fructose, sucrose, and starch also were utilized but mannitol was not. Cyathus helenae showed a tendency for latent utilization of nitrate nitrogen; growth was greater in a combination of nitrate and asparagine. Peptone was slightly inhibitory to growth.
The growth patterns of C. africamts, C. helenae, and C. striatus were similar on both a semisynthetic and a synthetic medium.