Observation 445050: Parmeliaceae

When: 2021-01-12

Collection location: West Feliciana Parish, Louisiana, USA [Click for map]

Who: katarinah

No specimen available

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This looks like
By: Jason Hollinger (jason)
2021-01-12 19:02:51 PST (-0800)

Myelochroa galbina or Hypotrachyna livida to me, but hard to say for sure or which of the two by photo. You could verify Myelochroa by checking for a very subtle yellowish pigment in the upper medulla when you scratch off the upper cortex. Also, Hypotrachyna livida will usually have pretty obviously repeatedly-forking tree-like rhizines, if you can find any lobes lifting off of the substrate. (If it’s closely attached, the rhizines are often so damaged by removal that it’s harder to interpret their topology.)