Notes:
It grows on granite blocks partially above moss in semi-shadow of pine-tree forest.
It is a loose and fragile powdery whitish crust with a sulphur tint. The cross-cutting is indistinct radial. May be Diploschistes scruposus is replaced by something different

Images

Photo 165.jpg
Photo 169_C test on the left_K test on the right.jpg

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Comments

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Sorry, my last comment was not well written
By: Jason Hollinger (jason)
2019-10-24 14:15:12 CDT (-0400)

I agree that the main (yellowish) thing here is Diploschistes. I think the bluer, powdery one could be Lepraria neglecta.

I am only cautioning that the Diploschistes could be D. muscorum, despite apparently growing on rock. Or an undescribed species within the complex.

White and light-grey Diploschistes here are red after NaClO
By: Igor (Igor_Yevdokimov)
2019-10-24 08:55:16 CDT (-0400)

White and light-grey Diploschistes here are red after NaClO
L. leglecta here has tiny balls above moss (in hand-lens) and this one looks as sulphur crystal powder (something new for me)

The powdery crust is probably Lepraria
By: Jason Hollinger (jason)
2019-10-19 09:46:19 CDT (-0400)

It is commonly associated with Lepraria neglecta (broad sense) in our deserts. Another possibility is Diploschistes muscorum. I know it doesn’t look like it’s growing on moss or Cladonia, but I find in our deserts that Diploschistes on rock always has exclusively 4 spores per ascus. And that is supposed to indicate that it is D. muscorum not D. scruposus as the habitat would suggest. I suspect even more that there are additional, possibly cryptic, species involved in this complex. For now, I agree that D. scruposus is the best name.