Phaeocalicium atenitikon is described new to science, growing on twigs of Juglans nigra (black walnut) in central North America. The species is characterized by small ascomata; an exciple of brown, periclinally arranged hyphae; notably small, pigmented, two-celled ascospores with pale septa; and its substrate and distribution. These are the first records of a corticolous Phaeocalicium from intermountain North America south of the Great Lakes region. Differences among similar species are discussed, and a worldwide key is provided for members of the genus with persistently 1-septate ascospores.
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4 January 2022
A new species of Phaeocalicium (Mycocaliciaceae) on black walnut in central North America
Douglas Ladd,
Caleb A. Morse
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The Bryologist
Vol. 125 • No. 1
Spring 2022
Vol. 125 • No. 1
Spring 2022
biogeography
calicioid fungi
corticolous microfungi
Illinois
Kansas
midcontinental United States of America
Missouri