This looks like what we thought may be Caloplaca pyracea before. But the apothecia really don’t have a very detectable margin, and the apothecia are quite tightly clustered.

Growing on Baccharis pilularis. This is a very minute lichen…


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By: James Bailey (Silversea_Starsong)
2016-02-26 17:37:52 PST (-0800)
Photo of sp-3?
By: J-Dar
2016-02-26 17:15:15 PST (-0800)

Is there one out there somewheres?

Well, it doesn’t look like cerina or sp-3
By: James Bailey (Silversea_Starsong)
2016-02-26 16:35:11 PST (-0800)

so we’d then know it is probably either pyracea or standfordensis.

Yeah, here we go again
By: Jason Hollinger (jason)
2016-02-26 16:02:23 PST (-0800)

I have a cheatsheet stuck in my Sonoran Flora for this group of Caloplaca: thallus gray or poorly-developed / inconspicuous, with orange disks:

C. cerina – conspicuous gray rims
C. pyracea, C. stanfordensis, C. sp. 3 sensu Wetmore 2007 – rims orange or inconspicuous

The latter three differ only subtly in spore size, anatomy of parathecium, degree and color of thallus and thalline margin present (I’m too tired to copy my table here!). We might be better off calling them all C. pyracea group (or C. holocarpa group) until someone does a thorough survey of a large enough quantity of material (including the type specimens in Europe) to work out the full range of variation in each species.

Created: 2016-02-26 14:19:18 PST (-0800)
Last modified: 2016-03-08 19:28:37 PST (-0800)
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