When: 2016-01-01

Collection location: Hawn State Park, Sainte Genevieve Co., Missouri, USA [Click for map]

Who: Patrick Harvey (pg_harvey)

No specimen available

Species Lists


Proposed Names

17% (2)
Recognized by sight
31% (2)
Recognized by sight
16% (2)
Recognized by sight
85% (1)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
I was going to ask about the difference,
By: zaca
2016-01-01 15:43:00 MST (-0700)

but as usual, you antecipate. The similarity is such that I don’t know if could split them apart. Thanks, Jason!

Oh wow, yes, look at this image
By: Jason Hollinger (jason)
2016-01-01 15:39:19 MST (-0700)

Totally different “soralia”. Zaca: have you seen material that looks more like Patrick’s specimen here? If so, you may well have multiple species where there was only P. clementei before!

Difference between P. americana and P. clementei
By: Jason Hollinger (jason)
2016-01-01 15:26:25 MST (-0700)

According to local flora (on the Ozarks region):

5. Soredia farinose, in well-defined orbicular soralia . . . P. americana
5. Soredia coarse and mixed with isidiate pustules, diffuse . . . P. clementei

This seems misleading, because according to Moberg in the Sonoran Flora Vol. I, P. clementei is more precisely pustulate, with the pustules breaking up into coarse (“granulate”) soredia that will finally cover the central parts of the thallus.

Thus, young P. clementei can be expected to have discrete “soralia”, too. The key character should be presence of pustular swellings before the soralia form. I’m not certain I see any. But that’s a subtle character.

If we assume Harris and Ladd correctly applyied the names to their material when preparing the Ozarks flora, then their comment about only seeing a single specimen of P. clementei in the whole area may be the deciding factor: by contrast, P. americana is common throughout eastern North America.