Observation 279815: Graphis Adans.

When: 2017-03-27

Collection location: Cambria, California, USA [Click for map]

35.5228°N 121.0644°W 207m [Click for map]

Who: J-Dar

Specimen available

This observation is split from observation 273834.

Thallus thin, white, continuous, with a thin black prothallus. Apothecia black, lirellate, often branched to stellate, longitudinal groove remaining mostly closed, epruinose. Hymenium hyaline, inspersed, K/I+blue. Epihymenium hyaline to yellowish brown, K-. Exciple black with green tinge.

Spores hyaline, 4+ septate, 18.5×4.4µm (immature).


Proposed Names

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Add Comment
Oh right, spore cell shape
By: Jason Hollinger (jason)
2017-06-24 21:48:56 -05 (-0500)

Knew I was forgetting something. Still, this looks like Opegrapha to me. Maybe see if the spore lumina still look lenticular in K or I. Spores in water can fool us.

It certainly could be
By: J-Dar
2017-06-24 21:41:45 -05 (-0500)

I went with spore cells lens-shaped rather than square, but that is pretty subjective without prior experience. Going square, it goes to Opegrapha. And the hymenium may well not be inspersed either, the photos show what I saw.

Does this look more like an Opegrapha?
By: Jason Hollinger (jason)
2017-06-24 21:22:37 -05 (-0500)

The thick carbonized exciple all the way under the hymenium… really tired now and memory may be failing me, but I think that might mean Opegrapha not Graphis.

Also, I think the photos show that the hymenium is not inspersed. (Of course, photos are not the same as seeing it in person, so if you’re sure, I’ll trust you despite the photos.)

Created: 2017-06-24 15:57:55 -05 (-0500)
Last modified: 2017-06-24 15:58:01 -05 (-0500)
Viewed: 41 times, last viewed: 2019-08-20 01:14:07 -05 (-0500)
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