Observation 360815: Psoroma Michaux

When: 2019-03-03

Collection location: Serra da Estrela-Parte Sul, Portugal [Click for map]

Who: zaca

No specimen available

Growing on moss in an alpine environment.


Microscopy: Asci and spores in lactic blue (x1000);
Microscopy: (Parts of ) Apothecial sections in water (x100);
Microscopy: (Parts of ) Apothecial sections in water (x100);
Microscopy: Algal layer (x1000);
Microscopy: Hymenium views in ammonia (x400);
Microscopy: Asci in ammonia (x1000);
Microscopy: Asci and paraphyses in lactic blue (x1000);
Microscopy: Asci in lactic blue (x1000);
Microscopy: Asci and paraphyses in lugol (x1000).

Proposed Names

29% (1)
Recognized by sight
29% (1)
Used references: British Flora: Smith et al., The Lichens of Great Britain and Ireland, 2nd edition, 2009.
58% (1)
Recognized by sight

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
Yes, Jason, it looks very much like …
By: zaca
2019-03-08 10:49:48 CST (-0600)

the photos of Psoroma hypnorum in CNALH.
However, the spores do not present two of the features mentioned there:
1) an apiculus at one or both ends, (this I found in Fuscopannaria ignobilis, see the thumbnail of observation 236133)
2) with prominent, warted-ridged epispore (as far as I understand, the epispores are like in some _Pertusaria spp., see e.g. the thumbnail of observation 358212, just to mention a recent one).
So, maybe this is yet another species.
Thanks for the help!

This looks just like Psoroma hypnorum from North America
By: Jason Hollinger (jason)
2019-03-08 10:27:53 CST (-0600)

Sorry I don’t remember details of spores without looking it up. Might have a description at CNALH. “Verrucose perispore” refers to the texture on the coating on the outside of the outer wall of the spore. I struggle to see it in your photos.

Definitively …
By: zaca
2019-03-08 06:10:09 CST (-0600)

Pannaria sphinctrina is a southern hemisphere species. I found in Research Gate the 1st page of the paper:
“Arve Elvebakk, The panaustral lichen Pannaria sphinctrina (Mont.) Tuck. and the related new species P. lobulifera from New Caledonia,Cryptogamie Mycologie 28(3):225-235, 2007.”
and from the abstract , I quote:
“Pannaria sphinctrina (Mont.) Tuck., is redefined as an exclusively panaustral lichen species, characterized by thin thallus lobes, ellipsoid, verrucose perispores and with vicanicin as its major secondary metabolite.”

I don’t exactly what is the meaning of “verrucose perispores”, but it is better to leave this specimen at the genus level.

I don’t know.
By: zaca
2019-03-07 17:03:19 CST (-0600)

I only find a link from Australia, but that doesn’t mean that the species is confined to the southern hemisphere.

Isn’t that
By: J-Dar
2019-03-07 16:56:50 CST (-0600)

a southern hemisphere species?

Microscopy added.
By: zaca
2019-03-07 15:35:46 CST (-0600)

The apothecia and the spores are very similar to those observed in a Fuscopannaria (see observation 236133), except for the extremities of the spores; However, The species in this genus have Nostoc as the alga and the photobiont observed is a green alga. Looking into the British Flora I learn that there is a group of Pannaria having a green photobiont, to which P. sphinctrina belongs.

Looking for images of this species I could only find to photos at the following Australian link
where the 2nd photo could be a close-up of the first one and is very similar to my specimen, namely with the same type of apothecia and also with discontinuous thallus formed by small green lobes. I could not find a description of this species, but certainly is very close to mine.

According to Index Fungorum, the current name for Pannaria sphinctrina is Psoroma sphinctrinum.

In my opinion you are right;
By: zaca
2019-03-06 11:15:20 CST (-0600)

I also remind the apothecia of some Fuscopannaria of the same kind. I’ll put it under the scope as soon as I can.

Something in the
By: J-Dar
2019-03-06 10:24:02 CST (-0600)

Pannariaceae family? Looks really interesting!