lichen for id please

[gleditsa]

i found this one growing on a young oak tree, there were quite a few (30+) of these on this particular tree, but none of the other oaks that were close by had any growing on them at all, is this a normal feature of lichens??
i had thought this might be a Parmelia sp:

1/

2/

is the lichen to the left of the picture (no2) a juvenile version or is it a different one altogether??

any suggestions much appreciated,

[CapAndBracket]

Here we are diving into a new field. From my limited knowledge/literature i
wonder if possibly Parmotrema perlatum, i think you have two species on
the second branch.

Cheers J.P.

[poschiavanus]

In no. 2, the lichen on the left is Physcia tenella (the ends of the lobes are turned back and expose greenish-grey soralia [=groups of soredia]), and the one on the right is Parmelia sulcata. This is a fairly common combination in areas with less clean air, and particularly common on Elders where I see it. The oak with the lichens probably leans slightly to one side or in some other way provides a slightly different micro-climate. Today I noticed a single Horse Chestnut in an avenue where the trunk was covered by Xanthoria parientina, whereas all the other trees where lichenless.

I'm pretty sure that no 1. is also Parmelia sulcata. There are paler lines over the thallus, so-called pseudocyphellae where the a layer is missing. Parmotrema perlatum has a much cleaner upper surface of the thallus.

posch

[gleditsa]

Originally Posted by CapAndBracket

Here we are diving into a new field. From my limited knowledge/literature i
wonder if possibly Parmotrema perlatum, i think you have two species on
the second branch.

Cheers J.P.

Hi JP , Parmotrema is not in the only book of lichens i have, so i cant compare it with my find,
i think my knowledge/literature is even more limited than yours
will have to do some web searches and see what comes up, fascinating subjects though,

[gleditsa]

Originally Posted by poschiavanus

In no. 2, the lichen on the left is Physcia tenella (the ends of the lobes are turned back and expose greenish-grey soralia [=groups of soredia]), and the one on the right is Parmelia sulcata. This is a fairly common combination in areas with less clean air, and particularly common on Elders where I see it. The oak with the lichens probably leans slightly to one side or in some other way provides a slightly different micro-climate. Today I noticed a single Horse Chestnut in an avenue where the trunk was covered by Xanthoria parientina, whereas all the other trees where lichenless.

I'm pretty sure that no 1. is also Parmelia sulcata. There are paler lines over the thallus, so-called pseudocyphellae where the a layer is missing. Parmotrema perlatum has a much cleaner upper surface of the thallus.

posch

many thanks for the identification,
so its not an unusual occurence for only one tree in a group to have a population of lichens then, there did not seem to be any difference to any of the trees in the group, but something clearly favoured the one tree

[CapAndBracket]

Three lichens found today, all on the same half rotten oak branch brought
down by hig winds.


Usnea.sp!





Cheers J.P.

[CapAndBracket]

I'm wondering maybe Evernia prunastri for the second image.


X20
This is underside of image 3. do the simple rhizines put this in Parmelia.sp.

Cheers J.P.

[poschiavanus]

Agree 1. is Usnea. Somewhere there is a thread where I listed some of the things one needs to check for Usnea. The easiest is whether the 'holdfast' is black or not.

2 very likely is Evernia. Different colouration to the two sides of the thallus sorts this one out, but its not always obvious.

3 I'll have to think about. Certainly Parmelia s.l.. Top of thallus seems clean, with soralia on ends of lobes. My first impression is Parmotrema perlatum, and if it is, the things in the photomicrograph are marginal cilia rather than rhizines (but dont ask me to explain the difference).

HTH,

posch

[CapAndBracket]

That certainly is helpfull, i can see there is some more terminology i need
to get a grasp of and add to the glossary.

Cheers J.P.

[CapAndBracket]

X20

Further investigation of yesterdays piece of branch produced two more
lichen species, the above maybe Amandinea.sp.


X20

And possible Lecanora.sp.

Cheers J.P.