Zs. P. Komáromy szerk.: Studia Botanica Hungarica 13. 1979 (Budapest, 1979)

Bohus, Gábor: Some results of systematical and ecological research on Agaricales, VII.

With respect to the effect of the air moisture content in artificial light, in a thermostat: if at about 17°C temperature the nearly 100% air mois content at times decreased to a value of about 80%, in almost all the fruit bodies- of the strain No. 14/74 at least one large disruption occurred. There were such fruit bodies in which deep disruptions occurring in the young age hampered the continuation of growth. If the air moisture content was kept at 100% or a value near to that, then the results given in the table below were obtained in the 3-month observation period: Strains Number of the fruit bodies Strains non-disrupted slightly disrupted moderately disrupted 14/74 24 15 3 14/3 78 1 0 14/4 8 a 0 According to these values, a high air moisture content caused the occurrence of the disrupting phenomenon to decrease but it did not make it stop. The examination of insolation and the heat effect of light: the source of light in the above experiment on the air moisture content was a Sylvania (USA) strip light of 5 W F 13, which was put at a distance of 18-26 cm from the growing fungi. Its heating effect was small (1-2°C) in the thermostat. After this light source, the cultures received the dispersed light that came through the glass opening of the thermostat, for three months. In this period, 37 fruit bodies No. 14/74 were grown, and in none of them was the slightest disruption observable. By inference it can be said that under the heating effect of the direct light, there occurs a microclimatically drier air content on the surface of the fruit body, and as a consequence disruption occurs. Further data on the ammonium-nitrogen utilization of Agaricus macrosporoides A satisfactory utilization of ammonium salts in fungi is an interesting question and at the same time it has importance in cultivation since ammonium compounds are more available than are sources of organic nitrogen. Concerning the utilization, investigations were carried out earlier (BOHUS 1978) but it seemed necessary to increase the number of experiments by applying other sterilization temperature, and by a method in which the nitrogen source of also the spawn was an ammonium salt.