Observation 114554: Peltigera aphthosa (L.) Willd.

When: 2012-10-24

Collection location: near Cape Lookout, Tillamook Co., Oregon, USA [Click for map]

Who: Daniel B. Wheeler (Tuberale)

No specimen available

Found about 5 miles south of Cape Lookout State Park, in beginning of sand dune area, but with full tree cover. This is found on the west side of the road, which receives more shade than the east side of the road.

Proposed Names

2% (2)
Recognized by sight: Broadly foliose bright green surface, with upraised reddish dots; white margins; underside white and slightly veinatious, toning to pink then black, and finally with fine hairs holding onto the sand and litter. Fingernail in second photo is 3/4 inch wide, for size.
43% (3)
Eye3 Eyes3
Recognized by sight
28% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I’ve seen P. britannica with tiny cephalodia (flecks), too
By: Jason Hollinger (jason)
2012-10-27 04:09:05 EEST (+0300)

They don’t always grow out into large flakes, but they’re always poorly-attached and kind of irregular in shape (as opposed to essentially rounded and convex to flat in aphthosa).

re: soredia

You should definitely have P. collina, but you’d want to look for it in trees, instead of on the ground or base of trunks. It’s the only species that regularly grows on twigs and limbs of trees, not just mossy tree bases.

Are cephalodia the flecks?
By: Daniel B. Wheeler (Tuberale)
2012-10-27 03:48:33 EEST (+0300)

If so, in Brodo those cephalodia are fairly large and easily flaking off. I do see where elements of the thallus have broken off in these photo, but those areas look to be the reddish-brown of P. aphthosa, at least as shown in Brodo. I wish soridia were present: I’ve been kind of hoping to find some.

Hard to say
By: Jason Hollinger (jason)
2012-10-27 02:57:42 EEST (+0300)

I’ve never managed to get a good feel for the structure of these cephalodia. I’m leaning toward P. britannica for yours, but it’s just a hunch.

Couldn’t tell if they were flecks or not.
By: Daniel B. Wheeler (Tuberale)
2012-10-27 02:50:39 EEST (+0300)

But the black areas were in shallow pits. Does that sound like flecks?

P. britannica is another option
By: Jason Hollinger (jason)
2012-10-27 02:13:50 EEST (+0300)

You need to check the gray/black flecks on the upper surface: in P. britannica they are flake off easily, and are only attached in the center not around the margins; in P. aphthosa they are fully-attached and less irregularly shaped.

Created: 2012-10-27 01:28:44 EEST (+0300)
Last modified: 2012-10-27 03:48:59 EEST (+0300)
Viewed: 31 times, last viewed: 2017-07-08 23:21:00 EEST (+0300)
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