Observation 218617: Opegrapha vulgata Ach.
When: 2015-10-11
Who: zaca
No herbarium specimen

Notes: Growing on the bark of Quercus suber.


Microscopy: Apothecial sections;
Microscopy: Asci and spores.

Proposed Names

58% (1)
Recognized by sight
87% (1)
Eye3 Eyes3
Used references: British Flora
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Microscopy added.
By: zaca
2015-10-14 19:05:03 CEST (+0200)

Spores hialine, acicular to fusiform, multiseptate (up to 8-9 septa), with dimensions:
(18.6) 20.4 – 24.9 (33.2) x (2.2) 2.6 – 3.2 (3.5) µm
Q = (6.5) 7.2 – 9.9 (10.5) ; N = 30
Me = 23.1 × 2.9 µm ; Qe = 8.2 .
Some of the older spore are constricted at septa.

Cheers, you are miles ahead from me!
By: zaca
2015-10-12 23:18:06 CEST (+0200)

Imagine what people can see in my photos and then ask me to describe it!
Good joke, Andrew.

While writing a response, I was trying hard not to violate the site’s rules.
By: Andrew Khitsun (Andrew)
2015-10-12 23:07:00 CEST (+0200)

I hope I managed to do it, so here is a link:
And crack is the right word for it too :)

Hi Andrew,
By: zaca
2015-10-12 16:57:49 CEST (+0200)

I don’t know what is your precise doubt here, but I think it is connected with the host tree – Quercus suber. At this location the trees are protected and they have never been ecorticated to produce cork, one of our products for exportation. So, at this place the trees, some with more than a century, can develop bark up to 12-13 cm in thickness. The lighter vertical mark that you see in the photo is the place where the bark cracked, which means that the mark has the new cork produced by the tree, becoming darker away from it. You can see similar photos of these cracks at image 455371 and image 455348, for instance. Any further doubt, please let me know.
Best regards,

I am curious not about lichen here, but about substrate (or rather what the substrate looks like :)
By: Andrew Khitsun (Andrew)
2015-10-12 15:30:49 CEST (+0200)

Created: 2015-10-12 13:50:37 CEST (+0200)
Last modified: 2015-10-14 19:13:26 CEST (+0200)
Viewed: 64 times, last viewed: 2017-03-10 11:39:01 CET (+0100)
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