Lasallia papulosa explained

Lasallia papulosa (common toadskin) is an umbilicate lichen (a lichen attached to its substrate at a single point).[1] It is in the family Umbilicariaceae.

Notes and References

  1. Lichen Vocabulary, LICHENS OF NORTH AMERICA, Sylvia and Stephen Sharnoff, http://www.lichen.com/vocabulary.html