Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
A lichen has lecanorine fruiting body parts if they are shaped like a plate with a ring around them, and that ring is made of tissue similar to the main non-fruiting body part of the lichen. The name comes from the name of the lichen genusLecanora, whose members have such apothecia. If a lichen has lecanorine apothecia, the lichen itself is sometimes described as being lecanorine.
References
^ Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, ISBN978-0-300-19500-2, page 279