Abstract
An egg showing a black internal discoloration was recently received by the Poultry Section of the Animal Nutrition Department, Cambridge, accompanied with a request that the cause of discoloration might be determined. The egg was purchased as being new laid.Externally the egg presented all the characteristics of a normal one, but, when held to the light, black discolorations in the interior could be observed. On breaking the shell these black discolorations were found to be present on the membrane, and also in the albumen. The yolk did not show signs of any discoloration.More detailed examination showed that the discolorations were due to the presence of a fungus, and this was determined as being a species of Cladosporium.HISTORYLafar (1) states that the putrefaction of eggs is not always due to bacteria, but frequently to Eumyctes, the most active of these being Cladosporium herbarum. As long ago as .
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