Observation 110950: Physcia adscendens (Fr.) H. Olivier
When: 2012-09-22
Who: zaca
No herbarium specimen

Notes: It seems that this discolored specimen is parasitised, due to the existence of plenty of black dots immersed in the thallus.

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You explained very well …
By: zaca
2012-09-26 14:36:34 PDT (-0700)

the doubts that arise when looking to a specimen like this. Thanks, Jason.

Limits of imagination
By: Jason Hollinger (jason)
2012-09-26 14:27:20 PDT (-0700)

Haha! Just looked at it full-size again… I’m undecided now, too. There are areas that are clearly strongly convex… but they seem always associated with the parasite. On the other hand, there is one lobe tip at the bottom of the photo which looks a lot like tenella: an upturned flap exposing the underside. The maculae might be associated with the parasite, too.

RE: “I think you can sort of see it trying to produce hoods”
By: zaca
2012-09-26 14:18:17 PDT (-0700)

No way, my imagination yet does not go as far.

I think you can sort of see it trying to produce hoods
By: Jason Hollinger (jason)
2012-09-25 17:06:15 PDT (-0700)

But you know what the two species look like in your area better than I do.

I agree,
By: zaca
2012-09-25 12:45:36 PDT (-0700)

though I was not able to choose between the two species cited: too maculate and without lip shaped soredia of P. tenella and without the characteristic hoods of P. adscendens.

I agree
By: Jason Hollinger (jason)
2012-09-25 00:00:08 PDT (-0700)

I think this looks like it’s trying to be P. adscendens, given sprawling lobes in a rosette and strong maculae. Maybe the parasite is preventing proper full development.

[Oh yes, and it has cilia, can only be adscendens or tenella.]

Created: 2012-09-23 13:36:36 PDT (-0700)
Last modified: 2012-09-26 14:23:52 PDT (-0700)
Viewed: 53 times, last viewed: 2016-10-25 13:19:50 PDT (-0700)
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