Observations on gymnoascaceae. VIII. A new species of arthroderma

Summary A new species ofArthroderma, A. tuberculatum, is described and illustrated. This new species is represented by two strains isolated from feathers of a robin and from an owl pellet. AlthoughA. tuberculatum is similar to the only other known species of the genus,A. curreyi, with regard to the characteristics of the perfect stage, the two species may easily be distinguished by virtue of the accessory spore forms.Arthroderma curreyi forms small aleuriospores whileA. tuberculatum produces large, tuberculate aleuriospores. The morphological development of the ascocarp is presented along with other diagnostic characteristics. Asci are formed through the intervention of croziers.