trc65's picture

Foliose lichen on top, crustose on side of wall

Observed: 24th April 2011 By: trc65
S159 Neighbourhood Nature - current student
trc65’s reputation in Fungi and Lichenstrc65’s reputation in Fungi and Lichens
Photo (13).jpg

Yellow and white-grey foliose lichen species on the top of a wall which is rough and seems fairly new. However, on the side of the wall, it seems only a yellow crustose species can grow very well. Is there much of a reason why?


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Species interactions

No interactions present.

Species with which Xanthoria parietina interacts


AlanS's picture

Closer view needed.

The foliose lichen is most probably Xanthoria parietina as suggested, but a closer view is needed for certainty (to rule out the rather similar X. calcicola).

The crustose lichen is most likely Caloplaca citrina, but a detailed close-up is needed. This is common on vertical surfaces of urban walls, often near the ground - humidity may well be a factor.