Definition of Peridermium
: a form genus of rust fungi having only the pycnial and aecial stages, characterized by the irregularly split or torn peridium, and formerly including many fungi that have since the discovery of their telial stages been placed in various other genera (as Cronartium and Coleosporium)
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Origin and Etymology of peridermium
New Latin, from peri- + derm- + -ium
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