Observation 67979: Xanthomendoza S. Kondr. & Kärnefelt

When: 2011-05-23

Collection location: Old Bridge North of Solano Park Circle, Davis, California, USA [Click for map]

Who: Byrain

No specimen available

Growing on a stone bridge with several other lichen species and moss. A creek regularly visited by waterfowl and other animals runs underneath it. I couldn’t find any apothecia and I see at least one long rhizine towards the bottom in the first picture. This would make it a Xanthomendoza sp.?



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Another photo
By: Byrain
2011-05-23 21:35:33 CDT (-0500)

I found another photo which I think shows the pruinose trait better and added it.

I think you’re right
By: Jason Hollinger (jason)
2011-05-23 20:56:25 CDT (-0500)

Both X. fallax and X. ulophyllodes can rarely grow on rock. It looks to me like the soredia are developing underneath the lobe tips. In X. fallax soredia develop between the upper and lower cortex creating at least some distinctive “bird’s nest” soralia, and I can’t find any in your photos. X. ulophyllodes should have coarse isidioid soredia on top of the margins (or so I read, I don’t know the species).

This is probably X. mendozae, I guess. It just looks wrong somehow. I’m used to it being more “shell-like” and more obviously pruinose or pale orange-powdery (you can see some pruina in older portions on one or two of the photos). X. mendozae is a rock species, and I’ve always found in on sheltered underhangs like this.

There really aren’t any other choices. (X. fulva has much narrower more delicate lobes, X. parietina and X. elegans are both fertile, etc.)

Created: 2011-05-23 20:06:33 CDT (-0500)
Last modified: 2011-05-23 20:19:23 CDT (-0500)
Viewed: 27 times, last viewed: 2017-06-09 12:50:25 CDT (-0500)
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