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When: 2016-04-15

Collection location: Southwest St. Louis Co., Missouri, USA [Click for map]

Who: weed lady (Sylvia )

No specimen available

Found on a landscaping tree (Purple plum) in an urban residential neighborhood. Proposing the name is strictly a shot in the dark. This is the best photo (cropped) I can get. Would call this a golden yellow color. Tried to crop out the various other lichens on this tree. Just one tiny spot of this on the tree. Read this species is a common urban lichen.


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= Observer’s choice
= Current consensus


Add Comment
By: weed lady (Sylvia )
2016-04-18 09:18:50 CDT (-0500)

Thanks for the explanation. At least now I know that lichen can be found on three substrates: wood, rock and soil. Saw one in Florida once that was growing on what I could hardly call soil. It looked like sand to me. But I guess sand would qualify with being called “ground up rock”. Thanks again.

Some species are more finicky than others
By: Jason Hollinger (jason)
2016-04-16 15:24:09 CDT (-0500)

It’s relatively uncommon for things to be able to grow on both bark and rock. Wood, especially strongly-weathered and dust-impregnated wood, is much more similar to rock (as far as lichens are concerned). Also, macrolichens (foliose and fruticose species) are much more likely to be indiscriminate. Crustose species, being much more intimately in contact with (often literally at least partially inside!) their substrate, are much more likely to be picky.

By: weed lady (Sylvia )
2016-04-16 15:18:46 CDT (-0500)

Observation #236132 is not mine, but I can see why you might get Judi and me mixed up. We both live in St. Louis County, but not real close to each other. We often post similar observations and visit many of the same locations. I found it interesting that her observation (236132) was found on rock and mine was on wood. I do not know if this is common in the lichen world (different substrates).

I agree, this looks a little too orange to be Candelaria
By: Jason Hollinger (jason)
2016-04-16 00:07:02 CDT (-0500)

And the thallus too intact. Candelaria concolor (and even more the western equivalent C. pacifica) tend to relaly disintegrate into masses of soredia. X. weberi has more distinct, tiny soralia and never disintegrate.

But ultimately, as Jason suggests, the K test is your most reliable solution.

I’m so bad with these ID’s!
By: J-Dar
2016-04-15 21:48:03 CDT (-0500)

But, might this be the same X. weberi that you posted in observation 236132? You got that wagon full of KOH?