williamsnr's picture

Grey foliose lichen on twig

Observed: 21st March 2010 By: williamsnrwilliamsnr’s reputation in Fungi and Lichenswilliamsnr’s reputation in Fungi and Lichenswilliamsnr’s reputation in Fungi and Lichens
IMG 6528 on twig,Turton, 21.3.10
IMG 6530 on twig, Turton, 213.10
Description:

A grey foliose lichen, brown apothecia with thallose magins on twig.

Identifications

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

Species interactions

No interactions present.

Comments

gardener's picture

Having looked closer there's

Having looked closer there's a possibility it could be Physcia stellaris but you'd need to check the medulla (inner layer of lobes, below cortex) to see whether it is K- (P.stellaris) or K+ yellow (P. aipolia). The cortex (outer layer) is K+ yellow for both.

Not sure from your photo whether there are pale pseudocyphellae present or not.

Physcia stellaris:
http://www.irishlichens.ie/pages-lichen/l-157.html

Physcia aipolia:
http://www.irishlichens.ie/pages-lichen/l-68.html

AlanS's picture

I agree

This is difficult. P. stellaris tends to have a more ulcerated surface away from the margins of the thallus (see on my own site), but not always so, as shown by Jenny's own photographs.

I am inclined to think this is P. stellaris, but the tests Jenny mentions are needed here.

Alan