Carmen Schneider's picture

Crustose lichen and moss

Observed: 19th February 2011 By: Carmen Schneider
S159 Neighbourhood Nature - course complete
Crustose lichen
Crustose lichen
Description:
Identifications

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.

Species with which Xanthoria parietina interacts

Comments

AlanS's picture

Not Pleopsidium

As noted above, the photograph is the foliose species, Xanthoria parietina.

Pleopsidium species are truly crustose, forming circular, deeply cracked thalli. The margins crack into radially elongated segments (areoli) but they are very different to the leafy lobes of Xanthoria.

There are, to my knowledge, two yellow Pleopsidium species in Europe, both arctic/montane I believe. One of these, P. chlorophanum is known from two sites in Britain, photo and more information given in the link below.

http://www.lichens.lastdragon.org/Pleopsidium_chlorophanum.html

Alan