Observation 216512: Opegrapha herbarum Mont.
When: 2015-09-19
Who: zaca
No herbarium specimen

Notes: Growing on bark.
the question here is whether or not it is lichenized; If lichenized then probably belongs to Opegrapha; otherwise, it can be an Hysterium.

Images

557242
557480
Microscopy: Something intend to be a section, alga and spores.

Proposed Names

29% (1)
Recognized by sight
29% (1)
Recognized by sight
58% (1)
Eye3 Eyes3
Used references: British Flora
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Microscopy added.
By: zaca
2015-09-20 16:32:03 CDT (-0500)

Following my comment in the notes, since this fungus is lichenized, it must be Opegrapha. I was not able to do a convenient microscopy, because the material was brittle, which made impossible to do a section of apothecia. Moreover, I was not able to find any ascus (it is then my impression that the material was already too old). Fortunately, I could find some disperse spores. Their features are: brown coloured (due to age?), 3-septate, with black thick septa and dimensions of:
(17.8) 18.9 – 21.7 (23) x (5.9) 6.4 – 8 (8.4) µm
Q = (2.4) 2.6 – 3.3 (3.6) ; N = 28; Me = 20.4 × 7.2 µm ; Qe = 2.9 .
Based mainly on the features of the spores, I think that this is Opegrapha herbarum.

Created: 2015-09-19 13:21:33 CDT (-0500)
Last modified: 2015-09-20 16:33:32 CDT (-0500)
Viewed: 38 times, last viewed: 2016-05-25 11:46:39 CDT (-0500)
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