Notes:
Growing on bark of Simmondsia chinensis (jojoba).

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There’s a little pruina
By: Jason Hollinger (jason)
2016-01-26 13:39:45 CST (-0500)

visible in the big apothecia almost dead center in the photo. But the pruina in question is on the thallus not the apothecia. And the detail isn’t sufficient to tell in these photos. All of the fertile Physcia in your area can have lightly pruinose apothecia.

P. albinea
By: James Bailey (Silversea_Starsong)
2016-01-26 13:30:38 CST (-0500)

apparently saxicolous anyway.

I can’t really detect any pruina from these pics, kind of tough when its white already I suppose. The online pics of that species show pretty dense pruina on the apothecia, enough to turn that area pale greyish or white. Do you think that is a point against biziana, or is that not important?

Depends on the type of pruina
By: Jason Hollinger (jason)
2016-01-26 13:08:15 CST (-0500)

It’s too big and broad-lobed to be P. aipolia or P. stellaris, I think. (Comparing it to the Pheophyscia in the same frame.) Leaves only P. biziana with coarse crystalline pruina and P. albinea with a thick cartilaginous shiny cortex with patchy epinecral layer which can resemble pruina apparently.

Created: 2016-01-26 01:54:06 CST (-0500)
Last modified: 2016-01-26 13:26:27 CST (-0500)
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