Wood Extract and Growth of Morchella

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Abstract
SUMMARY Growth of Morchella esculenta and M. crassipes in a medium of mineral salts, dextrose, casein hydrolysate, B vitamins and purine and pyrimidine bases at pH 4.5 is slight. It is markedly increased by the addition of natural preparations, especially wood extract. Wood extract is effective also at neutral reactions. The presence in natural material of an unidentified growth substance (or substances) for which Morchella is partially deficient is suggested, and some characterization of the substance(s) is given.