pf339's picture

Lichen zn (i)

Observed: 30th April 2012 By: pf339
S159 Neighbourhood Nature - course complete
pf339’s reputation in Fungi and Lichenspf339’s reputation in Fungi and Lichenspf339’s reputation in Fungi and Lichenspf339’s reputation in Fungi and Lichens
Lichen zn (i)
Lichen zn (ii)

Light grey-green foliose lichen growing on deciduous tree trunk in woodland. Branching tongue-like lobes with concentration of white spots (pseudocyphellae?)at lobe ends. Lobe pattern clear on smaller rosette at top of image (i). Only some of image (ii) in focus but it is a closer view than (i). Grey-green soredia on edges of lobes in the middle of the lichen rosette. Possibly Physconia perisidiosa.


Caution: Do NOT use iSpot to identify fungi to eat!

Some fungi are very poisonous so a mistaken ID could have serious consequences.

Species interactions

No interactions present.


synan's picture

Dobson (again)

I'm not on a mission to demolish Dosbon (2011), but the description of lobes "up to about 1mm wide" doesn't have me convinced. I assume he meant 1cm (and 2cm for P. grisea).


Edit: Porpidia crustulata has spores "10-17 mm long" in the key. Who needs a microscope?

(eek - becoming a pedant)

AlanS's picture

I agree

Yes, I have seen other examples, but there are also numerous slips and misprints in the "big flora" (Smith et al.) too.

There again, we must be careful with our preconceptions. In a recent practical, according to a student's notes, she had a spider (young Pirata piraticus?) that was 4.5µm in length. I might not have believed this, and it did look quite a lot larger to me at the time, but it was corroborated in the notes of the student sitting next to her ...


synan's picture


You've reminded me that it's probably time I owned that hefty tome now (not to mention a microscope). This lichen lark doesn't come cheap.


pf339's picture


Thank you for the information. Followed up 'pruina' and interested to learn that calcium oxalate is often involved.