1. Hirst, J. M., Ann. App. Biol., 39, 257 (1952).
2. Hirst, J. M., Trans. Brit. Myc. Soc., 36, Part 4, 375 (1953).
3. Keay, R. W. J., “An Outline of Nigerian Vegetation”, pp. 14–23 (Gov. Printer, Nigeria; Crown Agents, London, 1953).
4. Brooks, C. E. P., Quart. J. Roy. Met. Soc. London, 42 (1916); 46 (1920).
5. Gregory, P. H., Ann. App. Biol., 38, 357 (1951).