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Recognized by sight: Infertile, isidiate species

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A huge thank you!
By: Pgrunow
2017-01-25 10:22:22 PST (-0800)

I had been practicing with lichens at the time, but I have forgotten a lot and definitely need to get back to studying them! Yes, either of those species could occur at this location. Thank you again.

Fertile and infertile Xanthoparmelia
By: J-Dar
2017-01-25 06:28:31 PST (-0800)

species often co-occur, so you have a thalli with obvious large brown apothecia mixed with some like this that lack fertile structures and instead are covered with asexual propagules, in this case called isidia (all the little bumps on the surface of the lichen). Look at photos of Xanthoparmelia mexicana and X. plittii. Ultimately you will need chemistry to determine your ID I think. The genus is pretty easy to recognize, so anywhere you have rocks you will be able to distinguish fertile vs isidiate Xanthoparmelia, and amaze your friends, the rest is up to the taxonomists!

Also, the second photo I think shows immature thalli of a fertile species, so maybe best to delete that one.