MY attention has been directed to a letter published in Nature of February 9, 1957, by F. C. Wood on Sporendonema, in which it is stated that the fungus known to mushroom growers as ‘red Geotrichum’ and ‘lipstick mould’ is invariably referred to as Geotrichum sp. The letter proceeds to report its identification by Mason and Hughes as Sporendonema purpurascens.