Abstract

The pyrenocarpous lichen Henrica americana is described as new. It is the second known species of the genus that is related to Polyblastia. The new species is characterized by small, brown, umbilicate squamules on a black hypothallus; black, double-walled perithecia perched on the squamules or on the stipes; and brown muriform ascospores. It is known only from a single locality in Montana.

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