Observation 90421: Xanthomendoza weberi (S. Kondr. & Kärnefelt) L. Lindblom
When: 2012-03-18
Herbarium specimen reported

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Bird-nest soralia
By: Andrew Khitsun (Andrew)
2012-05-06 18:53:53 CDT (-0400)

I examined a number of similar species in the area. It turns out X.weberi has some bird-nest soralia too. “Soralia in lobe tips, often forming small bird-nest soralia” – that’s from L.Lindblom (Bryologist 2006). And, as you pointed out, the dominant species here has narrow and branching lobes. So I’ll call this observation X.weberi, with some X.fallax mixed in.

Good, I see what you’re talking about
By: Jason Hollinger (jason)
2012-03-20 01:38:25 CST (-0500)

Continuing to focus on image 206534, I see the “vase-like” soralia in the center just where you said to look. I think I also see two types of lobes: top just left of center; also just up and to right of center, in the “next group” over. Those lobes have very different shape than the rest: convex, broad, oranger maybe; the rest are narrow and branching regularly and flat or ascending a bit. I think there’s every reason to suspect two species intermixed here. The “fallax” soralia are all dingy-colored, as if they are the remnants of an older overgrown thallus. The resulting mixture could be very hard to tease apart even under a dissecting scope.

Normal people, I feel obliged to point out at this point, would say “we’ve proven both fallax and weberi occur here, let’s cut our losses on this one”. :)

Perhaps you’re right (or maybe not ;-)
By: Andrew Khitsun (Andrew)
2012-03-19 20:51:01 CST (-0500)

At first I thought that I had two species here, with X.fallax sitting in the middle of X.weberi. You’re right about lobes, but I was looking at the middle of the lichens – at older thallii, and I thought I saw those vase-like soralia of X.fallax (see the middle of the second photo, and to some degree the third one). I can’t figure it out under the microscope either – it might be just lobes with soralia underneath turned upside down and inside out – I just don’t have enough experience with this (and I don’t see pycnidia under microscope – maybe I didn’t grab the part that has it, even though I have several pieces). Either way, I think my reference to enother observation holds true, even if the species turns out to be different. I’ll save the specimen for you.

You’re going to hate me
By: Jason Hollinger (jason)
2012-03-19 20:28:53 CST (-0500)

I’m just so negative. I think this might be X. weberi not fallax. It’s hard to find soralia. The lobes are narrow and regularly forking. The pycnidia are prominant. The few soredia I do see appear to be underneath the lobes. Do you read this differently?

Redux
By: Andrew Khitsun (Andrew)
2012-03-19 20:14:00 CST (-0500)

I was trying to find the specimen depicted in observation 88906 There are two species there, I think, and this is one of them photographed again.

Created: 2012-03-19 20:01:47 CST (-0500)
Last modified: 2012-05-06 18:49:16 CDT (-0400)
Viewed: 169 times, last viewed: 2016-01-21 18:02:49 CST (-0500)
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