Development of stromata and the imperfect state ofEutypella parasiticain maple

摘要

Effused and isolated stromata ofEutypella parasiticawere delimited by zone lines and contained ascogonial coils intermixed with mature perithecia throughout the year. The imperfect state was associated with perithecia in red maple and Norway maple bark but was not found in sugar maple bark. Conidial pustules were closed or variously opened labyrinthiform structures without a distinct wall and contained conidia 24ndash;29ensp;times;ensp;1ndash;1.5ensp;mu;. The imperfect state was characteristic of both the form-genusCytosporinaand the form-genusLibertella.