The Fungus (Haplosporangium parvum) in the Lungs of the Beaver (Castor canadensis)

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Abstract
The lungs of a beaver trapped in Minnesota in 1941 were found to be spotted with thousands of small white pearl-like nodules. The organism was not identified until 1948 when publications by Jellison and E. Silver Dowding on H. parvum in rodents appeared in 1947. Dr. Dowding identified the organism from the beaver lung as being similar to if not identical with H. parvum. The cyst wall of H. parvum from the beaver, surrounding the chlamydospore is made up of 2 layers. The inner is 0.21 mm. thick and consists largely of fibrous connective tissue; the outer is 0.5 mm. thick and consists of polymorphonuclear leucocytes and lymphocytes and a small amt. of connective tissue. The chlamydospore itself is 209 [mu] in diam. After the death of an infected animal the chlamydospores germinate in the soil and the saprophytic phase of the fungus begins. Heavy infections of this fungus must almost certainly be pathogenic. Extensive tissue reaction occurs in the host due in part to the large size of the fungus.

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