When: 2011-10-16

Collection location: Ableman’s Gorge State Natural Area, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

No specimen available


Proposed Names

56% (1)
Recognized by sight: very distinctive crisped margins

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= Observer’s choice
= Current consensus


Add Comment
I was hoping you wouldn’t ask
By: Jason Hollinger (jason)
2012-03-25 00:52:12 CST (-0500)

There’s no direct comparison between the species in Lendemer’s sterile crustose key, the best eastern reference I know of. They have different P test, so they live on different branches in his key. It’s worth noting, I think, that James considers this crisped margin sufficiently noteworthy to define an entirely new group of Lepraria around it (see the other paper I sent you a week or so ago), yet he doesn’t see fit to mention it in connection with L. membranacea. In fact, he just lumps it together with L. diffusa and L. vouauxii. Neither of these other two species has a determinate margin. Why would he fail to mention such a critical and obvious character to separate these three species? But we all make mistakes, I guess.

Sonoran flora attributes far too much variation to vouauxii and excludes membranacea from the flora altogether, so it’s no help.

British flora calls diffusa – and this is a shock – diffuse. It also explicitly mentions the raised margin in membranacea: “extreme margin often turned upwards to form a narrow raised rim, but rim sometimes weakly developed”.

Both Lendemer and the British Flora, incidentally, mention a yellowish color to membranacea (from dibenzofurans, whatever those are).

All I know, personally, is that the final photo in your list is easily one of the finest photos and specimens I’ve seen of this species! If that’s not L. normandinoides, I’ll eat my hat. (Fortunately I don’t wear hats. :)

The clear plan of attack at this point, given its frequency in your area, is to get a specimen to someone who has access to PPD. There’s no mistaking P+o/r for P-. All doubt will be removed concerning L. normandinoides, at least.

What happened to L.membranacea?
By: Andrew Khitsun (Andrew)
2012-03-24 19:08:05 CST (-0500)

It doesn’t seem it has been deprecated, and I’ve seen descriptions talking about these crisped margins. On the other hand, I’ve just come across MO page where someone (I think it was Chris) posted a link to J.Lendemer’s article on L.normandinoides. The distribution maps there show L.normandinoides much further south and east, but CNALH shows one record from Michigan. I don’t mind being first to “discover” this species in WI, but would like to learn the difference between this one and L.membranacea. This lichen is fairly common here – I have another photo from Interstate State Park in Minnesota.