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11-01-2015 16:16

Dark spots on Caragana
Marja Pennanen

Hello forum,these about 0,2 mm wide spots on Carag

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Dark spots on Caragana
Marja Pennanen, 11-01-2015 16:16
Hello forum,

these about 0,2 mm wide spots on Caragana turned to be pyrenomycetes.
They are much wider than high and seem to grow under the outermost layer of the bark.
The spores are at least now hyaline, 18-24x4-6 and contain 4 droplets.
The asci are about 70-120x9-12.

Help with the determination is truly welcome: Marja
  • message #33144
  • message #33144
  • message #33144
Alain GARDIENNET, 11-01-2015 22:02
Alain GARDIENNET
Re : Dark spots on Caragana

Hi Marja,


Probably an Arthopyrenia species.


Alain

Marja Pennanen, 12-01-2015 13:44
Re : Dark spots on Caragana
Cher Alain,

merci!

So, it may be a lichen.  This is an interesting piece of information for me.
I have thought, that lichens grow on a surface not under it...

Marja
Björn Wergen, 28-01-2015 12:30
Björn Wergen
Re : Dark spots on Caragana
Hi Marja,

indeed Arthopyrenia. This genus belong to a group of lichens called "pyrenocarpous lichens", because they simulate pyrenomycetes fruitbodies. They occur on the bark of various deciduous trees, in my region Arthopyrenia cinereopruinosa is commonest.

regards,
björn