When: 2015-09-12

Collection location: Parque de Monsanto, Lisboa, Portugal [Click for map]

Who: zaca

No specimen available

Growing on a cement wall.
Note the irregular thallus, the conspicuous small apothecia with orange discs and the whitish margin.


Chemical reactions.
Microscopy: Sections, exciple and epithecium;
Microscopy: Asci and spores.
Probably a sterile form of this species.

Proposed Names

29% (1)
Recognized by sight
58% (1)
Recognized by sight
87% (1)
Used references: British Flora
Based on microscopic features

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= Observer’s choice
= Current consensus


Add Comment
By: zaca
2015-09-14 01:11:26 CEST (+0200)

I was looking to the key for Lecania in the British Flora and conclude that the term “blastidia” is the one which characterizes the vegetative propagules (nor isidia neither soredia) present at this specimen. If that is so, then the key clearly indicates Lecania erysibe.
Moreover, at the description of that species it is mentioned that sometimes it can form extensive sterile colonies, being then distinguished by the minutely blastidiate, non-pruinose thallus. I recall that at the place of the observation an extensive patch of a sterile form was developing, being similar in the coloration and form of the thallus, but almost without blastida or having only a insipient form of it, as far as I can see. I upload a photo of it.

Microscopy added; This must be Lecania! which one will be?
By: zaca
2015-09-13 23:17:25 CEST (+0200)

Spores hialine, 0- to 1-septate (guttulate and simple when young becoming 1- septate at maturity), with the following dimensions:
(10.1) 11.4 – 15.1 (17.5) x (4) 4.3 – 5.4 (5.9) µm
Q = (2.3) 2.4 – 3 (3.3) ; N = 35
Me = 13.1 × 4.9 µm ; Qe = 2.7 .
The apothecial section and the spores features clearly indicate Lecania, but the overall features are dificult to attribute to a species. I have to consult the keys of this genus before try to give it a name.