Collection location: Carrizo Plain, San Luis Obispo Co., California, USA [Click for map]
On calcareous sandstone.
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I get S. arenosa from a variety of sandstone types, some calcareous, and a few collections from shale. All of that of course dependent upon ID verification! But these are the Sarcogyne with well developed thallus.
Our only record from NV is on a “calcareous pebble”… whatever that is!
Right, no sandstone, isn’t that weird? The whole state practically would be sedimentary except for all of the volcanism associated with the Basin and Range rifts. So lots of limestone, quartzite (extremely hard quartzite!) and rhyolite / rhyolitic tuff. Of course, everything is there somewhere — granite, basalt, shale, caliche, etc. etc. — but not as a significant substrate for lichens.
on fist-sized rocks strewn on dry depauperate hillsides. No sandstone? That seems odd!
I forget that Great Basin scarcely has any sandstone, so obviously can’t be exactly like the Great Basin. I wonder if I’d find more Sarcogyne arenosa if I spent more time around sandstone in Nevada (or our equivalent, volcanic ash).
Yes, I can definitely see why you had to stop at that outcrop. Amazing habitat!
I was just passing by and not technically on a lichen foray, but you know how it goes, I had to spend a few minutes there! Looked like a lot of Rusavskia and white Acarospora composed of the A. strigata thing and that possibly parasitic one, probably some Caloplaca crenulatella mixed in, Psora decipiens in soil filled cracks, lots of Caloplaca albovariegata, some brown Acarospora, the Verrucaria furfuracea, Caloplaca “tangerina”, and yes there was Rinodina bischoffii and three species of Sarcogyne (arenosa, hypophaea, and regularis). I will definitely be making a collecting trip in early 2020…