Observation 95582: Parmelia squarrosa Hale
When: 2012-05-20
Herbarium specimen reported

Proposed Names

76% (2)
Eye3 Eyes3
Used references: ID provided by Jason Hollinger
2% (2)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Darn, I wish I documented everything as well as zaca!
By: Jason Hollinger (jason)
2015-12-18 06:01:08 CET (+0100)

But I’ve got no photos of the rhizines. In fact I don’t even have any notes, just a name and a code indicating that I was positive. :( Presumably I found some truly squarrose rhizines somewhere… it only takes one!

The dispute is settled:
By: Andrew Khitsun (Andrew)
2015-12-18 05:08:03 CET (+0100)

some guy Jason Hollinger just called it P.squarrosa (#5202012-1)

Yay! What did I win?
By: Jason Hollinger (jason)
2012-05-29 09:40:53 CEST (+0200)
You won
By: Andrew Khitsun (Andrew)
2012-05-29 01:24:48 CEST (+0200)

I re-examined the specimen – even though there are some oddly branched rhizines, I failed to find any squarrose ones.

Would need TLC to distinguish them chemically
By: Jason Hollinger (jason)
2012-05-28 04:32:46 CEST (+0200)

Both are going to give you strong K+ yellow turning blood red.

People have shown me examples of furcate rhizines before, and they really do look quite different than squarrose. Wish I had a good picture of each to demonstrate. Squarrose rhizines have lots of tiny side-branches at right angles to the main “trunk”. Furcate rhizines branch more irregularly at various angles and the branches are similar in size. The tangle in the center is a mess, I agree. Check around the edges carefully. If you can’t find any clearly squarrose, then my guess is it’s probably P. saxatilis. (It definitely does occur on trees; mossy log is perfectly acceptable.

Could be P.saxatilis too
By: Andrew Khitsun (Andrew)
2012-05-28 02:14:59 CEST (+0200)

This is on fallen tree, so it could be either species. The only difference, according to Thomson, is rhizines – squarrose in P.squarrosa (surprise!), and simple to furcate in P.saxatilis. I can’t really tell: the rhizines on the very tips of the lobes are definitely simple, but deeper under the body of the lichen they’re a tangled mess, obviously not simple but hard to figure what they’re are. I couldn’t find a single one that would look like a textbook squarrose rhizine, so probably P.saxatilis. There are bunch of acids that are different, but it’s not clear how to check for them.
As far as finding decent specimens, I just don’t bother with the ones I don’t like, usually, unless it’s unfamiliar species and I want it identified. Sooner or later, something photogenic comes along. I only wish I had DSLR camera, not point and shoot – sometimes lighting conditions or a tiny size (or both) are too much for my point-and-shoot.

Have you considered P. saxatilis?
By: Jason Hollinger (jason)
2012-05-27 10:53:37 CEST (+0200)

Is this on mossy rock? I’m sure you’re right, but something about it nags me. Maybe just because I’m not sure I understand the difference between P. squarrosa and P. saxatilis yet…

Beautiful specimens as always. I’ve grown so accustomed to this that posts from elsewhere look sad by comparison. You lucky dog, to live in such a rich area. (Or do you just have a really good eye??)

Created: 2012-05-27 02:53:05 CEST (+0200)
Last modified: 2015-12-18 05:58:42 CET (+0100)
Viewed: 119 times, last viewed: 2016-10-26 15:08:06 CEST (+0200)
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