Observation 117649: Xanthomendoza fallax (Hepp ex Arnold) Søchting, Kärnefelt & S. Kondr.
When: 2012-10-28
Herbarium specimen reported

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Used references: ID confirmed by Jason Hollinger

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Ah, yes, that would be bark, not rock! :)
By: Jason Hollinger (jason)
2012-11-22 14:33:24 CST (-0500)

I was just asking a lichen ecologist why some bark species will sometimes grow on wood and/or rock, but not others, and what the important (for the lichen) differences in the substrates were. The abridged answer was: “wouldn’t that be an interesting thing to study?” :)

This was on roadside trees, actually
By: Andrew Khitsun (Andrew)
2012-11-22 14:08:57 CST (-0500)

And on trunks layig on the ground. At the end of October, there was no leaves to betray the species, although I could’ve dug around to find fallen ones, but I didn’t take those pains since I didn’t realise the importance of this (isn’t it typical for me in general?). Road is not particularly heavily used, but adjacent fields might have something to do with it, if your theory is correct ( the crops planted and fertilisers used etc.). I’ll be watching this issue in the future. By the way, most X. fallax I’ve found on rocks so far was in the shade with strong greenish hue)

By: Jason Hollinger (jason)
2012-11-22 13:58:50 CST (-0500)

I wonder what would make it oranger? I wonder if this rock is more nutrient rich than usual. Xanthorias in general are nitrophiles. Maybe particularly rich sites stimulate excess parietin (orange pigment) and trigger apothecia production?

This is the most fertile I’ve ever found.
By: Andrew Khitsun (Andrew)
2012-11-22 13:52:08 CST (-0500)

In fact, I thought this was the biggest colony of X. hasseana I’ve ever come across (the entire lower part of the tree was covered), until I realised it’s all sorediate and there is no X. hasseana there. The other thing pretty unusual is the color. Most of our X. fallax are usually yellow (if they grow on the sunny side) or conspicuously greenish or even green (if they grow in the shade). These guys are brazenly orange.

I’m forced to agree
By: Jason Hollinger (jason)
2012-11-22 13:37:10 CST (-0500)

I take it this is unusually fertile even for your area?

Large apothecia
By: Andrew Khitsun (Andrew)
2012-11-22 11:47:47 CST (-0500)

Everybody is probably tired of my X. fallax by now. The reason I decided to post these is their large apothecia. When I picked them up I thought I had X. hasseana mixed in, but it doesn’t seem to be the case. Of course, you can see Candelaria concolor in the picture too. But it seems there is no other species of Xanthomendoza mixed in with these – no X. weberi nor X. ulophyllodes there, only X. fallax with its nest-like soralia (you can see some in the picture if you squint, although they are not very prominient here). If someone sees something else here – let me know, so I can tease my specimen apart to find out.

Created: 2012-11-22 11:38:21 CST (-0500)
Last modified: 2015-12-27 23:01:28 CST (-0500)
Viewed: 76 times, last viewed: 2017-06-14 11:52:29 CDT (-0400)
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