Honeycomb Lichen

Menegazzia terebrata is a species of lichen found scattered across the Northern Hemisphere. Recognizable by its inflated thallus with holes in the upper surface and soredia bursting from lobe tips. The thallus is light blue-green-gray with 1-2mm wide rounded lobes, inflated and tube-like, and with distinctive large, round perforations in the upper surface; lower surface black, wrinkled, without root-like attachments (no rhizines), anchoring thallus to the substrate. Sometimes called the Honeycomb Lichen or Keyhole Lichen because of the conspicuous holes in the thallus.