One twig's worth of lichen!

[Gerel]

Hello again.

The following were all growing on a single metre long twig. I've had a guess at ID's as far as genus for some of them but expect to very wrong

Lecanora sp. ?



Posibly Hypnogymnia physodes and/or H. tubulosa



Flavoparmelia sp.?



Closest I could see was an Opegrapha sp.



Evernia pruastri ?



Continued in "One twig - part II"

[JennyS]

Hi Gerel - here's my half-pennyworth!

1. Trying to avoid noticing these!

2. You've got both Hypogymnia physodes (first pic) and Hypogymnia tubulosa (second pic)

3. Melanelia species could be worth checking out ..... but I'm having trouble with these ones myself!

4. Graphis scripta maybe - but thats very, very tentative.....

5. Yes!

[Chris Yeates]

hi

I think that 1 could well be Lecanora chlarotera

the moss looks like it could be an Orthotrichum species

best

Chris

[AlanS]

Yes, 1 is almost certainly Lecanora chlarotera - as far as can be told without a cross-section of the apothecium.

I agree with Jenny on the others. The Melanelia (to be Melanelixia when the new Flora comes out in April) is most likely M. fuliginosa subsp. grabratula. It is much confused with M. subaurifera, but the second photograph looks like the lichen is developing the diagnostic cylindrical isidia of M. fuliginosa, and it is a bit too shiny for M. subaurifera. (I don't blame Jenny for having trouble with these, British books are not very helpful.)

4 could be Opegrapha atra, but, like Jenny, I incline towards Graphis scripta. Sometimes one just has to use the microscope!

Alan
(Wondering whether to issue a safety warning about inclining towards Graphis scripta. Last time I did that I almost fell into Loch Lomond.)

[Chris Yeates]

Originally Posted by AlanS

Yes, 1 is almost certainly Lecanora chlarotera - as far as can be told without a cross-section of the apothecium. . .

hi Alan
pardon my ignorance, but could you enlighten me on this one?

cheers

Chris

[AlanS]

Originally Posted by Chris Yeates

hi Alan
pardon my ignorance, but could you enlighten me on this one?

cheers

Chris

Lecanora chlarotera is part of a difficult group in which the presence/absence of crystals in different parts of the apothecium is important. L. chlarotera has a layer of crystals above the paraphyses, this layer not penetrating far down into the hymenium, and also large crystals in the thalline margin.

There are basic diagrams in Dobson and (slightly unexpectedly to me) a page of excellent, detailed drawings in the British Lichen Society's 'Microchemical methods for the identification of lichens', by Alan Orange et al.

I am waiting with interest to see how this group is treated when the new lichen flora is published (whenever that will be, no announcement yet on the BLS website even if there are predictions elsewhere).

Alan

[Chris Yeates]

thanks for the above, Alan!

Chris