caused by a new species of Exserohilum. Phaeohyphomycosis of the nasal sinuses

cellsfrom the golden-brown intermediate cells. The Arizonaisolate produces conidia that are cylindroellipsoidal andsmoothwhenyoungbut becomingunevenly roughened withage. They conspicuously lack dark, thick-walled distoseptathat separate the pale endcells fromthe othercells compos-ing the conidia.Becauseofthese differences, the Arizonaisolate wassentto the Commonwealth Mycological Institute. Kew,