When: 2018-06-11

Collection location: Grover Hot Springs State Park, Alpine Co., California, USA [Click for map]

Who: Pgrunow

No specimen available


Proposed Names

2% (2)
Recognized by sight
2% (2)
Recognized by sight: info and references to be added
61% (2)
Recognized by sight: small, I agree, but at full-resolution, you can see the lobes are terete

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= Observer’s choice
= Current consensus


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These tiny ones are hard to separate from the rock
By: Jason Hollinger (jason)
2018-06-16 17:22:53 CDT (-0500)

There are definitely some challenging forms of X. elegans! Clearly a polymorphic (and probably polyphyleltic) species. But C. saxicola is … well, it has its own problems! … but it is comparatively, fairly well-behaved (read: “consistent”). Its lobe tips are clearly wider than thick, and while convex, they are nevertheless adnate (except on those rare substrates which erode out from under it). There are some forms of X. elegans which have broad flattened lobes, too (perhaps mostly in the east in North America, although I think I’ve seen them in the alpine, so maybe northern as well). But those forms are huge compared to C. saxicola so there is no trouble distinguishing them. (But then you have to worry about C. trachyphylla and other species!) Fortunately, in arid localities, X. elegans tends to have almost terete lobes like yours here. Sometimes you just have to look around until you see them growing side-by-side to really be sure. (And they are both ubiquitous, so you really can almost always find them growing side-by-side at any given locality! C. saxicola tends to grow in more shaded spots, especially near the ground, at least in my experience. So look for the interface.)

By: Pgrunow
2018-06-16 17:02:01 CDT (-0500)

I tried peeling it off the rock, but I need to get better at telling it apart

Created: 2018-06-11 21:36:45 CDT (-0500)
Last modified: 2018-06-16 17:22:54 CDT (-0500)
Viewed: 56 times, last viewed: 2019-08-23 12:04:25 CDT (-0500)
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