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Abstract: On a slight modification of the synthetic medium devised by Treschow (Dansk. Bot. Ark. 11 : 6, 1944), the growth of several strains of the white capped form of Psalliota bispora is promoted by the addition of yeast extract or acid hydrolysed casein. This effect can be reproduced by the addition of several amino acids along with thiamine. Phenylalanine and methionine are the most active when added alone with the exception of one strain which appears to possess practically an absolute requirement for proline. Other strains are promoted by proline while tryptophane and tyrosine show less significant activity.. Combinations of these amino acids produce greater growth promotion than any single one alone, the greatest effect being produced by a mixture of all five. ZUSAMMENFASSUNG Der Verfasser studiert die Wirkung gewisser Amino-Saeuren auf die Entwickhung des Psalliota Bispora. Das Phenylalanine und das Methionin sind die wirksamsten Amino-Saeuren aber wenn man die verschiedenen Amino-Saeuren in gut bestimmten Verhaeltnissen mischt, dann ist der Ertrag noch viel besser. RESUME L'auteur étudie l'action de certains acides aminés sur le développement de Psalliota Bispora. La phenylalanine et la methionine sont les acides aminés les plus actifs, mais en associant les divers acides aminés dans des proportions bien définies, le rendement est encore meilleur.
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