1. Yamamoto, W., Yoshitani, K., and Maeda, M., Sci. Rep. Hyogo Univ. Agric., Agric. Biol. Ser., 2, 69 (1955).
2. Brian, P. W., Curtis, P. J., and Hemming, H. G., Trans. Brit. Mycol. Soc., 29, 174 (1946).
3. Wieland, P., and Prelog, V., Helv. Chim. Acta, 30, 1028 (1947).