Reviewing the notes of this collect I've noticed that there may be two species of Calicium mixed on the same substrate.
I came back to look at the microscope and I note that there are two types of spores:

1.-spores with spiral ornamentation belonging to the apothecia with brown capitulum and an average size of 8.1-9.1 x 4.2-4.7um, we determine as C.salicinum.

2 -. Larger spores (12.1-13.3 x 5.9-6.5um) with warty ornamentation and irregular cracks, belonging to the totally black apothecia (top left image macro).

These last apothecia could belong to C.abietinum?

Thank you, greetings

Susana

Amazing !

Ascospores are fissurate-areolate, >12 µm, yes it'sprobably  C. abietinum. A very interesting collect !

I suppose that you haven't seen thallus ?

But you also should look towards C. denigratum. Compare the to descriptions to choose.

Alain

First, I have no experiencie in determining this type of fungus.
I looked again the sample.
In my first impression I believed that there was not thallus, I believed it was a very deteriorated surface (Figure 1, left).
Now, I see that appear areas with development of surface thallus (Figure 1, right).
When cut also seems confirmed the presence of surface thallus. One poorly developed thallus.

It would then be C.viride. In two different states of development: young apothecia (brown) and mature (black)?

what do you think?

Thanks

Susana

It's coming more difficult... often Caliciales are associated.

It's not sure that the green granular thallus is the one of  the two caliciales (perhaps a third one or another lichen). Calicium viride has a green thallus sometimes granular, but some authors give a different spore's ornementation (I read it could be  partially spiraled in C. viride, but sometimes it's said it could be with irregular cracks). Not easy.

Do you want keys for this genus ?

Alain

I used information found on the Internet:
- KEYS TO GENERA AND SPECIES OF Caliciales IN NORWAY (http://www.thavibu.com/caliciales/keyes.htm) and
- Http://lichenportal.org/portal/taxa/index.php?taxon=51834&taxauthid=1&proj=1 for descriptions.

If you have additional information, I would like to receive it.

Thank you very much, greetings

Susana

Hi Susanna,

A few days ago, I found the same lichenized fungus. I think it's Calicium glaucellum. But apothecia shloud be pruinose (white) . I will post photos in database.

Alain