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Abstract: Growth rate is defined as the change of weight with time. The expansion and extension of the stipe and cap during the development of the sporophore was studied by Bonner et al. (1956) and Flegg and Gandy (1956). Later Cooke (1960) demonstrated that sporophore growth followed a sigmoidal curve and that from the second to the fifth day of its development, growth was linear. A relationship between cap diameter and the fresh weight of sporophore was observed by Flegg and Gandy (1956) and conformed to CAP DIAMETER3 = 12.5 X FRESH WEIGHT for mature sporophores or flats, and for sporophores in the cup stage of development, CAP DIAMETER3 = 7.5 X FRESH WEIGHT. This kind of relationship suggested a means by which the growth and weight of a given break or flush of sporophores could be predicted and also provide an invaluable experimental method of measuring growth without having to remove sporophores from culture substrates. Detailed investigations were done to define precisely the relationship between the pileus diameter and sporophore weight. A photographic technique was devised for recording cap diameter so that a continuous measurement of a large number of sporophores could be obtained in situ.
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