Observation 65556: Xanthomendoza fallax (Hepp ex Arnold) Søchting, Kärnefelt & S. Kondr.
When: 2011-04-15
Who: Byrain
No herbarium specimen

Notes: Growing on living Casuarina equisetifolia bark. Maybe another Xanthoria? I think I see some hapsters in the last picture in the red box.

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By: Byrain
2011-04-15 23:44:40 CDT (-0500)

the detailed comments are much appreciated.

PS. the two genera
By: Jason Hollinger (jason)
2011-04-15 22:36:17 CDT (-0500)

I still have the habit of referring to both Xanthomendoza and Xanthoria as just Xanthoria sensu lato. They are undoubtedly good genera (everyone accepts them), but in the field they are very difficult to disentangle, unless you happen to see loads of long stringy rhizines, as in X. hasseana / X. montana. Far easier to treat them together if you aren’t a taxonomist. Sorry, if there was confusion.

Distinctive species
By: Jason Hollinger (jason)
2011-04-15 22:32:50 CDT (-0500)

It produces soredia (granules) between the upper and lower cortex along the margins, the result is that it sort of “delaminates”. You need to separate it from X. fulva in the keys (produces soredia under the lobe tips and margins, but not in the space between the flaps of the upper and lower cortices). But X. fulva is a relatively narrow-lobed species, while X. fallax usually looks just like this — sort of broad and flat.

(In theory this has long rhizines, but in practice they aren’t easy to find, in my experience. But the soredia and broad lobes make it unnecessary.)

Created: 2011-04-15 20:01:12 CDT (-0500)
Last modified: 2011-04-15 22:27:57 CDT (-0500)
Viewed: 46 times, last viewed: 2016-10-28 04:20:09 CDT (-0500)
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