Pannaria is shown to include species whose thallus ranges from the almost homoiomerous to the fully differentiated heteromerous state. A new species of Pannaria is described, P. santessonii, with a thallus closely resembling that characteristic of the Collemataceae. Lepidocollema carassense Vainio and Lepidoleptogium montaguei A. L. Sm., the type species of these respective genera, have beenfound to have a similar type of thallus. Further study of the relationship between thesegenera is needed.
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