Lichens have a few different ways to reproduce (they're just awesome like that) but most lichen symbioses include an ascomycete fungi, AKA a sac fungi. These fungi create spores in internal sacs known as asci (singular: ascus), and lichenized ascomycetes often house these sacs in their apothecia, or fruiting bodies. So you see those dark spots on the surface of our pal L. intricata here? Those are its apothecia, or its fruiting bodies, from which fungal spores will be ejected to go out and hopefully form their own little lichens someday. Pretty neat, huh? L. intricata is a crustose lichen with a verrucose (wart-like)-areolate (tile-like) thallus. It has a gray-green to yellow-green surface sitting atop a dark prothallus (a layer of fungal hyphae). It should look something like puzzle-pieces on a dark surface. It has blackish-green to brown, irregularly shaped apothecia immersed in the thallus surface. L. intricata grows on silicious rock and occasionally wood in montane, boreal, and arctic habitats.
An international group of qualified mushroom identifiers who do worldwide identification in emergency cases have identified the Shroomers App as a potentially very dangerous system that could kill you if you try to use it to identify edible mushrooms. They use AI to generate almost all of their content, including their identification profiles on their app as well as their books and other materials. Not only is this unethical from a content creation standpoint, it is also extremely dangerous.
DO NOT USE APPS FOR IDENTIFICATION PURPOSES BEYOND SIMPLE CURIOSITY. A MISTAKE WHEN IDENTIFYING AN EDIBLE COULD COST YOU YOUR LIFE. DO NOT EAT ANY FORAGED MUSHROOM YOU CANNOT IDENTIFY YOURSELF BY SIGHT OR HAS BEEN IDENTIFIED IN PERSON BY SOMEONE WHO CAN.
ONLY BUY BOOKS FROM REPUTABLE SOURCES AND AT THIS POINT THAT MEANS ASKING EXPERIENCED PEOPLE WHAT BOOKS THEY USE.
Mushrooms are fun, amazing organisms. Enjoy safely.