Observation 87389: Caloplaca cerina (Hedwig) Th. Fr.
When: 2011-04-17
No herbarium specimen

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Now you’re talking!
By: Andrew Khitsun (Andrew)
2012-02-05 20:26:51 CST (-0500)
Thanks for keeping me honest, Chris!
By: Jason Hollinger (jason)
2012-02-05 19:56:37 CST (-0500)

Yes, I meant “holocarpa” not “holopolia”. Don’t know where that came from!

By: Chris Parrish (kitparrish)
2012-02-05 18:59:44 CST (-0500)

This analysis fits very well with the discussion of Caloplaca in Thompson’s Lichens of Wisconsin (2003, pp.52-56), but I think the second name is Caloplaca holocarpa. The only “holopolia” in the North American checklist is Lecidea holopolia. In Thompson’s Caloplaca key, after choosing

Growing on bark or old wood
Thallus esorediate
Disk yellow-orange to red-brown
Disk waxy yellow, orange-yellow to orange
Thallus gray, thin, or disappearing
Apothecia orange-yellow

come two choices:

1a. Apothecia orange-yellow; margin grayish; spore septum 5–8 μm thick … Caloplaca cerina
1b. Apothecia orange-yellow; margin also orange-yellow; spore septum 3–5 μm thick … Caloplaca holocarpa

Caloplaca cerina : “This species grows on tree bark, occasionally on old wood. It is pantemperate and in Wisconsin occurs over most of the state.”

Caloplaca holocarpa : “This is a common bark inhabiting species, especially on Populus, but may also occur on rocks. It ranges over much of boreal to temperate North America. In Wisconsin it is common over much of the state.”

It’s obvious now that I know what to look for.
By: Andrew Khitsun (Andrew)
2012-02-05 17:25:18 CST (-0500)

But on the other hand, of all the goodies listed below, only C.ulmorum has been found in WI so far (not surprisingly, if it’s the same species as C.cerina). But then again, J.Bennett says crustose species are badly undercollected in the state, and any serious foray by a knowledgeable group of people would yield few dozen species new to the state.

By: Jason Hollinger (jason)
2012-02-05 15:49:16 CST (-0500)

C. cerina has light to medium gray continuous thallus, on bark, and orange apothecia with gray rims.

C. holocarpa is anything with scattered orange apothecia and slightly yellower orange rims, on wood or rock of any type, with absolutely no thallus or with scattered orange patches (or even better-developed in some photos on-line at least). I have no clue what “defines” the group. Just about anything with orange (not red) apothecia, lacking or with poorly-developed orange thallus matches the description in practice!

In your photos, just look at the rims of the apothecia. Some have gray rim (and the gray thallus is visible around them); some have bright yellow-orange rims (with only plain white bark visible around them). The C. holocarpa apothecia seem to be denser and a bit smaller, too, but maybe that’s just me.

Which one is which?
By: Andrew Khitsun (Andrew)
2012-02-05 15:18:17 CST (-0500)

I couldn’t find anything on C.holopolia. Which one is that in the photos, you think?

According to Wong & Brodo 1992
By: Jason Hollinger (jason)
2012-02-05 14:19:35 CST (-0500)

You have both C. cerina and C. holocarpa here. I think it’s safe to rule out C. ulmorum because I don’t see the gray thallus of C. cerina becoming subsquamulose anywhere.

Just bear in mind, that both C. cerina and C. holocarpa are species complexes. The former has a rough treatment (Wetmore 2007). Options include: the C. borealis / C. kamczatica group (no algae in apothecia or rims), C. crocea (spores with two septae instead of the usual one), C. pinicola and two other unnamed species (spore septum < 4 µm thick), and of course C. cerina itself. I don’t know the state of knowledge of the C. holocarpa group.

Lastly, note that C. ulmorum has been synonymized with C. cerina s. str.! Good grief. :)

On poplar tree
By: Andrew Khitsun (Andrew)
2012-02-05 12:38:07 CST (-0500)

Created: 2012-02-05 12:34:56 CST (-0500)
Last modified: 2012-02-05 12:37:48 CST (-0500)
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