Observation 103540: Parmotrema reticulatum (Taylor) M. Choisy
When: 2012-07-28
Who: zaca
No herbarium specimen

Notes: Some features of this specimen not perceptible in the photos:
- Growing on exposed rock;
- Lobes small, up to 4 mm;
- Underside black, with simple rhizines also black;
- Chemical reactions on medulla and soredia: C-, K+ yellow to red, KC+ red.

Proposed Names

29% (1)
Recognized by sight
61% (2)
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Recognized by sight: with reservations, see comments

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My doubt was the size,
By: zaca
2012-08-02 16:07:55 PDT (-0700)

All the rest fits well. Thanks, Jason.

I know what you mean
By: Jason Hollinger (jason)
2012-08-01 17:03:05 PDT (-0700)

I see this form on rocks mostly. It is an extremely common species in southeastern US. In any population you can find a wide variation in lobe width. Does everything else match up well enough? I see the fine reticulate cracks clearly; the long cilia are common; the piles of soredia (again coarse soredia like this seem to be more common on rocks, maybe both characters are a response to whatever stress is inducing it to grow on rock instead of the usual bark?); chemistry is right; rhizines sound okay, too. It doesn’t give great confidence, I agree, but there it is. Apparently this is just what it does.

With so small lobes?
By: zaca
2012-08-01 16:48:50 PDT (-0700)

That’s what make me doubt.

I’d say…
By: Jason Hollinger (jason)
2012-08-01 16:36:40 PDT (-0700)

this is one of the many forms of Parmotrema reticulatum. (I just read in an old paper for California that this has been called the most common foliose species of lichen in the world. :)

Created: 2012-08-01 16:03:59 PDT (-0700)
Last modified: 2012-08-03 13:37:44 PDT (-0700)
Viewed: 27 times, last viewed: 2016-10-22 01:34:17 PDT (-0700)
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