Vertical section of the apothecial disc of an Ochrolechia sp, seen in Florida. The left is under white light, the right is with 365nm UV. This species normally fluoresces yellow on the thallus, with only the apothecia shining blue.

For my first post here, enjoy some mushrooms I saw in Yellowstone a few weeks ago. Most flowering plants in the park were past their prime by this point, but the late showers had tons of mushrooms coming up. Species names in the alt text.