Observation 57682: Peltigera Willd.

When: 2010-10-31

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

Who: Patrick Harvey (pg_harvey)

No specimen available

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Recognized by sight
61% (2)
Recognized by sight

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Oh yes, definitely Peltigera
By: Jason Hollinger (jason)
2010-11-02 02:13:24 CST (+0800)

All you need to see to be sure of that is the veins and rhizines on the underside, which are visible under the lobes that are turned up. You can also rule out vast swaths of the genus because it’s not green, it has no soredia, the apothecia aren’t black or flat — leaving only the canina and polydactylon groups. The former group is tomentose at least near the margins (merely dull in the one exceptional species, P. degenii), the latter group is shiny and smooth (although scabrose and appearing dull in one exceptional species, P. scabrosa!). If shiny, then your only real option is P. polydactylon since it isn’t broad enough (or the right geographical region) for P. neopolydactyla. (A good look at the underside would confirm this readily.) If tomentose… well then it’s tricky. It could be several species, most likely P. canina or P. praetextata.

By: Patrick Harvey (pg_harvey)
2010-11-02 00:01:49 CST (+0800)

Thank you, Jason. I didn’t bring this one back with me. Can you
see enough to identify this as simply a Peltigera species?

By: Jason Hollinger (jason)
2010-11-01 06:44:32 CST (+0800)

I can’t make out a few details: Tt would be good to double-check that there are tomentose hairs on the upper surface especially near the margins. It would also be good to see more of the underside. If it is P. polydactylon, you would expect it to be shiny and smooth and entirely hairless on the upper surface, and the lower surface should have broad, barely-raised veins which often turn very dark and contrast sharply with the small elliptical white interspaces between the veins.