Observation 111132: Peltigera praetextata (Flörke ex Sommerf.) Zopf
When: 2012-08-07
Herbarium specimen reported

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Apparently I’m full of …
By: Jason Hollinger (jason)
2012-09-25 23:34:48 PDT (-0700)

That was my understanding, but I was wrong. I see a very convincing report of it in the New England flora. It must extend all the way across Canada, then, at least. My previous comment must only apply to southern states. Sorry! Keep looking. :)

You ruined my chance to get P. canina :-(
By: Andrew Khitsun (Andrew)
2012-09-25 20:40:49 PDT (-0700)

Oh, well… Are you saying P. canina is mostly western species?

Nice try!
By: Jason Hollinger (jason)
2012-09-25 00:28:16 PDT (-0700)

You certainly aren’t the first to try to call this form of P. praetextata P. canina. This is the basis for (apparently) all the reports of P. canina in the eastern US. But Trevor Goward insists that it is not. R.C. Harris is of the same opinion.

The critical character for the species is not the regeneration lobules — alas! ignore all the keys! they’re all wrong — it’s the veins and rhizines. True P. canina (Rockies and west, especially northern) has poorly defined veins and brushy rhizines near the margin that turn into a woolly mass in the interior. P. praetextata has distinct narrow veins all the way into the interior (typically rather pale) and rope-like rhizines throughout. You can find problematic material (especially in cold wet weather when it’s growing fastest) where the outer rhizines of praetextata have brushy-bushy tips. I’ve had Trevor verify several such specimens, and they still all come out praetextata. Yours, however, is unambiguous. Those are classic simple rope-like rhizines.

The thing you most want to look out for, because I think it does occur in the northwestern Great Lakes area, is P. membranacea. That has even more raised and distinct “overlapping” veins, and the rhizines (also simple and rope-like) are covered with dense fuzz of tiny erect hairs (not quite tomentum because that implies the hairs are woolly, it’s more a dense puberulence in botanical jargon).

First I thought it was Peltigera praetextata
By: Andrew Khitsun (Andrew)
2012-09-24 17:59:28 PDT (-0700)

Just because I got used to it – it’s so ibiquitous here. But I didn’t find any lobules on this specimen, so I think it must be P. canina

Created: 2012-09-24 17:53:11 PDT (-0700)
Last modified: 2016-02-01 20:00:22 PST (-0800)
Viewed: 48 times, last viewed: 2016-10-22 17:42:56 PDT (-0700)
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