Observation 203002: Porina aenea (Wallr.) Zahlbr.

When: 2015-04-11

Collection location: Sintra, Portugal [Click for map]

Who: zaca

No specimen available

This observation refers to the pyreno (lichenized or not) that is growing on bark close to a Graphis sp. and that, at places, invade its thallus. The pyreno has smaller perithecia and different thallus than the Pyrenula spp. I´m used to observe and can be of other genus, like Arthopyrenia, Porina and (maybe) many others.


Microscopy: Perithecia in ammonia;
Microscopy: Asci and spores;
Microscopy: Asci and spores of the other pyrenomycete, parasitizing or sharing the thallus with the Graphis sp.,

Proposed Names

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


Add Comment
Porina aenea?
By: zaca
2015-04-22 16:37:29 CDT (-0400)

Porira aenea is the only species in the British Flora with the features of this specimen, namely:
- Growing on bark;
- Having purple pigments on the involucrellum;
- With 3-septate spores.
However, the spores, for which I obtained the following dimensions:
(14.9) 15.3 – 18.4 (20.6) x 3 – 3.6 (3.9) µm
Q = (4.4) 4.5 – 5.7 (6.7) ; N = 22
Me = 16.9 × 3.3 µm ; Qe = 5.1,
are a bit narrow compared with the dimensions given there: 13 – 20(-24) x 3.5 – 5 µm, but not too much. Even though, I think that this is it.

Let me also add that, as can bee seen in the 2nd photo attached and I refer in the notes, seems that the pyreno was invading the thallus of the Graphis sp.; I conclude that there is another species with perithecia, the one sharing the thallus with the Graphis sp., having bigger perithecia than the Porina sp. and different spores, namely 1-septate. I was not able to identify it, not even to genus.

Created: 2015-04-18 19:27:44 CDT (-0400)
Last modified: 2015-04-23 13:41:59 CDT (-0400)
Viewed: 44 times, last viewed: 2017-12-10 15:56:31 CST (-0500)
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