Observation 197304: Rhizocarpon pusillum Runem.
When: 2014-10-04
38.9912° -114.3207° 3673m
0 Sequences

Notes:
on Sporastatia testudinea on quartzite; small grassy-rocky bench on broad northwestern ridge of summit, geology a mixture of siliceous metamorphic rocks

epihymenium dark brown turning violet-brown in K, exciple and hypothecium dark brown K-, spores 8 per ascus 1-septate brown ~15×10um

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Thanks!
By: Jason Hollinger (jason)
2015-01-28 11:52:22 CST (-0500)

Neat species, isn’t it? One of those rarely-collected things which is actually really common once you know to look for it. All those yellow Rhizocarpon kinda look the same… but there’s only one that grows as a hemiparasite on Sporastatia! And Sporastatia is dirt-common in the alpine throughout the intermountain region. Actually, there are quite a number of things which grow as a hemiparasite on it (e.g. Calvitimela armeniaca, Caloplaca epithallina), probably taking advantage of that hyperabundance. Probably a whole lot easier for a lichen to establish on another lichen in such conditions than on bare quartzite. There are a few other common hosts, too, Pleopsidium flavum and Lecanora rupicola aggregate, for example. And, sure enough, there’s a species of Rhizocarpon geographicum group which grows exclusively on Pleopsidium flavum, too!

nice pics
By: Rowan Puttergill (roboro)
2015-01-28 11:44:51 CST (-0500)

I particularly like 84…
but they’re all cool. I like the texture against the quartz. :)

Created: 2015-01-28 03:43:24 CST (-0500)
Last modified: 2015-02-01 17:47:47 CST (-0500)
Viewed: 81 times, last viewed: 2017-06-19 20:24:59 CDT (-0400)
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