Observation 192265: Arthonia punctiformis Ach.

When: 2014-10-12

Collection location: Merrimac, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

Specimen available

Proposed Names

29% (1)
Recognized by sight
86% (1)
Eye3 Eyes3
Used references: Jason Hollinger ID

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Gestalt is particularly difficult with Arthonia, but…
By: Jason Hollinger (jason)
2015-04-26 12:06:12 CDT (-0400)

You’ve got a good eye, so you’ll probably be right the majority of the time. And the odds are definitely improved if the specimens are nearby, growing in the same conditions, and likely sharing the same genes.

I believe in you, Andrew! :)

Jim Bennett returned the same ID: A.punctiformis
By: Andrew Khitsun (Andrew)
2015-04-26 01:41:00 CDT (-0400)

Which is the way it should be, of course. But picking up specimen from several different trees, I never know for sure if my visual identification is correct.

This one actually coughed up some spores!
By: Jason Hollinger (jason)
2015-01-25 10:47:50 CST (-0500)

No algae present; spores 8 per ascus, hyaline, 3-septate, cells approx. equal but tapering a bit toward one end, ~22-23×7-8µm.

Another common species – this one on oak (red oak group).
By: Andrew Khitsun (Andrew)
2014-12-07 16:43:09 CST (-0500)

Arthonia punctiformis is the only one positively identified from this group of lichen in my collection – the difficulty being many of them don’t cough up any spores. This one has distinctive metal-grey color. The specimen is waiting to be identified.

Created: 2014-12-07 16:33:48 CST (-0500)
Last modified: 2015-04-26 01:35:10 CDT (-0400)
Viewed: 54 times, last viewed: 2017-06-19 13:53:19 CDT (-0400)
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