VIII. Onygena equina, willd., a horn-destroying fungus

Abstract
Some time ago Mr. Crossland, a student in this laboratory, brought me a cow’s horn much decomposed, and covered with a fine growth of a fungus— Onygena . The specimen had been found lying on the wet grass on a hill in Derbyshire. The decomposing horn evolved a strong odour of ammonia, and its outer parts flaked off easily as cheesy, skin-like, or almost papery, opaque, white bits, the handling of which left a penetrating ammoniacal odour on the fingers, reminding one of the smell of peptone which has been kept in too damp a place. A glass rod dipped in HC1, and held near the horn, was at once surrounded by a white cloud. Underlying the ammoniacal odour, however, there seemed to me to he another and more persistent sour smell. Since very little is known of this fungus, I have made a thorough examination of it.

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