Observation 194158: Flavoparmelia caperata (L.) Hale

When: 2014-12-21

Collection location: Brady, Grays Harbor Co., Washington, USA [Click for map]

Who: catnip40

No specimen available

I thought this was Xanthoparmelia conspersa at first because a website said this species can occur on many trees, rather than just rocks. However I’m not too certain on the credibility of that website now. As most other websites list this as only growing on rocks from what I have been reading. I want to say there was one other website that said this could grow on trees too but I can’t find it now.

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Eye3 = Observer’s choice
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I’m sure it’s possible to find Xanthoparmelia on trees
By: Jason Hollinger (jason)
2014-12-21 21:03:28 CET (+0100)

But it’d be very rare, and the conditions would probably be unusual, e.g., the bark is really dirty and impregnated with sand or mineral soil, or it’s right next to a huge population on rock, or it’s on really old weathered wood of an exposed root or fence post, not bark.

In this case, however, you can ignore the substrate. The key difference is the texture of the soredia/isidia on the upper surface. This specimen is wrinkled with coarse isidioid soredia forming from warty growths. The isidiate Xanthoparmelia have nice clean distinct fully-corticate isidia. The pustulate structures on these specimens are typical of Flavoparmelia caperata.

(There is a rock-dwelling Flavoparmelia baltimorensis, too. And it’s not particularly easy to distinguish the two, especially when on rock, where both species can occur. But fortunately, F. baltimorensis is almost never found on trees, whereas F. caperata is one of the most common epiphytic lichens in eastern North America. So we don’t need to worry about it! :)

Created: 2014-12-21 16:46:27 CET (+0100)
Last modified: 2015-03-29 20:38:47 CEST (+0200)
Viewed: 51 times, last viewed: 2017-06-30 13:24:43 CEST (+0200)
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