Collection location: Borovoye National Park, Akmola District, Kazakhstan [Click for map]
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
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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)
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.