When: 2018-11-03

Collection location: Stockbridge, Henry Co., Georgia, USA [Click for map]

Who: Chris Cassidy (cmcassidy)

No specimen available


Proposed Names

28% (1)
Recognized by sight
28% (1)
Recognized by sight
84% (1)
Recognized by sight: fine isidia, and does it has fine network of minute wrinkles covering the lobe tips?

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= Observer’s choice
= Current consensus


Add Comment
Oh totally!
By: Jason Hollinger (jason)
2018-11-05 09:56:53 PST (-0800)

There are some real challenges at the beginning.

For example, lichenologists mean very specific things when they say “yellow”. This usually refers to the presence of the pigmented substace usnic acid, which indeed is quite yellow in its pure state!, but in a living lichen just makes it look sort of a milky-green to my eye. Lots of people claim Rhizocarpon geographicum is green… really?? That’s clearly bright yellow to me! And so on. Color is a huge hurtle at first.

Another one which probably really is applicable to you is lobe width. What a joke! But an experienced lichenologist knows exactly what they mean when they say “these genera have narrow lobes, these have broad lobes”. Lots of luck trying to make your measurements of lobe width in, say, Parmotrema or Xanthoparmelia match the descriptions. I don’t even bother trying any more. :)

Not to mention, of course, the specialized terms like isidia, soredia, etc. Not least because there is a continuum of forms between isidia and soredia, and the terminology just doesn’t quite work for many of them.

But as you become familiar with the common species, you can use them as reference points, and things will start to fit into place rapidly. And that is where MO and its intrepid band of amateur-experts comes in very handy. We can at least confirm your common species, speed that process up a bit. And if we’re lucky, help you avoid some of the common pitfalls everyone makes at the beginning. Don’t hold your breath, though. :)

By: Chris Cassidy (cmcassidy)
2018-11-05 09:02:27 PST (-0800)

Looked very much like Flavoparmelia for a novice like myself. I’m still trying to get accustomed to the terminology; some overlapping terms that I know from the Agaricomycetes side, but still lots of unfamiliar terms related to Lichen related specimens. This makes keying our potential fits a little tough for me (but I’m getting there lol).

Good species to learn by sight
By: Jason Hollinger (jason)
2018-11-05 08:24:54 PST (-0800)

1, it’s very distinctive and recognizable at a glance, and 2, it’s suprisingly difficult to key out for some reason. For one, it often looks too green in the field, so I frequently used to wind up going down the usnic acid branch and getting stuck among Flavoparmelia and Flavopunctelia. And the spot tests (it’s KC+ fleeting faint pink and UV+ bluish-white, I think) are especially faint and easy to misdiagnose.

Yes, it does.
By: Chris Cassidy (cmcassidy)
2018-11-05 07:48:57 PST (-0800)

Didn’t realize when taking the photo that my aperture stop was very low, hence the depth of field and inability to examine more closely.

Created: 2018-11-04 07:01:23 PST (-0800)
Last modified: 2018-11-05 09:56:54 PST (-0800)
Viewed: 33 times, last viewed: 2019-01-02 05:56:54 PST (-0800)
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