Observation 68032: Umbilicaria
When: 2011-05-21
Who: zaca
No herbarium specimen

Notes: This observation took place very closely to that of MO68031. It seems that are mainly young specimens of Lassallia pustulata and also some mature ones.

Proposed Names

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Used references: See MO68031
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Like I said …
By: zaca
2011-05-25 13:16:32 CDT (-0500)

… concerning observation MO68031 initially I thought it would be all specimens of the genus Umbilicaria. In that sense, I had already consulted the usual sites in search of species likely. With regard to this particular observation, I saw two species that could be potential candidates: Umbilicaria grisea and Umbilicaria hirsuta. However, I did not knew if these could just be young specimens of Lasallia pustulata, which can not be according to Jason’s comment, since the juveniles of this species show very early the pustules that are features. Unfortunately, to reach a conclusion I would need to have collected some material, what I did not. I will give a look to the genus Dermatocarpon.
Thanks, Jason, for the clarifications.

I’d guess Umbilicaria or Dermatocarpon
By: Jason Hollinger (jason)
2011-05-24 19:57:05 CDT (-0500)

The thing in the first photo doesn’t look like a young Lasallia to me. It should have pustules right from the start. It is actually very common to see multiple species of Umbilicaria growing together, sometimes with Lasallia as well (the two are closely related genera). Dermatocarpon (included mostly for completeness) typically grows in different places. I can’t remember ever seeing a mixture of both Umbilicaria and Dermatocarpon on the same rock. (The former prefer very exposed bright surfaces, the latter often is found in sheltered locations.)

I can’t suggest a species of Umbilicaria, though. Underside is very important for this genus. Umbilicaria is much more diverse than Lasallia, and I find the literature difficult to interpret.

Created: 2011-05-24 06:25:17 CDT (-0500)
Last modified: 2011-05-29 15:17:51 CDT (-0500)
Viewed: 57 times, last viewed: 2016-04-29 12:23:19 CDT (-0500)
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