Observation 65235: Graphis scripta (L.) Ach.

When: 2009-05-04

Collection location: Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

No specimen available



Proposed Names

34% (2)
Recognized by sight
61% (2)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Variable to say the least!
By: Jason Hollinger (jason)
2011-04-10 14:06:12 PDT (-0700)

Graphis scripta is all over the board, no question. But always with black elongate apothecia and long multi-septate spores. The apothecia continue to grow and branch with age, so a young one might just have elongate simple slits, while an old one can have huge stellate crowded massive things. Texture of the surface depends a great deal on environmental conditions, from smooth and thin on nice young maple bark, for example, to verrucose and cracked on rough old bark, to orange(!) where covered with free-living Trentepohlia (a remarkably common occurrance — I think the algae can escape from lichenization readily in certain conditions and start growing free on top of the thallus).

If you have a microscope, it’s well worth the effort to dice it up and look for spores! :)

By: Andrew Khitsun (Andrew)
2011-04-10 13:23:29 PDT (-0700)

If it is, indeed, Graphis, it must be G.scripta. The only other species listed in Lichens of Wisconsin by J.Tomson is G.intricata, but it looks different and clings to Mississippi river valley. G.scripta seems to be very varieable – I have photos that look very different from these ones but are 100% G.scripta.

I totally agree
By: Jason Hollinger (jason)
2011-04-10 08:56:32 PDT (-0700)

99% of the Graphis you see north of Florida seem to be G. scripta. (It’s a good thing they have beautiful spores, or I’d be seriously miffed after examining so many specimens in vein hope of finding something new. :) These are typical of what the species looks like when well-developed.

Interesting species association with the Arthonia. I haven’t studied that one nearly as much.

By: Andrew Khitsun (Andrew)
2011-04-05 21:44:37 PDT (-0700)

This Lichen looks like some species of Graphis. Interestingly, it’s often accompanied by what looks like Arthonia radiata (see background of all three pictures). I have more photos from different locations with the same arrangement, and the lighter lichen is always in the center or near the center of Arthonia. It’s as if we’re looking at the same species with two different forms, or patches of different age. Weird.

Created: 2011-04-05 21:37:48 PDT (-0700)
Last modified: 2011-04-10 13:30:33 PDT (-0700)
Viewed: 92 times, last viewed: 2017-11-17 14:47:50 PST (-0800)
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