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29-01-2026 10:04
Jean-Paul Priou
Bonjour à tous, Marcel LECOMTE président de L'A
Hello.A very tiny pyrenomycete sprouting sparsely but abundantly on the surface of a debarked, fallen pine log, appearing on the side in contact with the ground.
Disc-shaped or flattened grain-like ascomata, black in color, with a diameter of only 0.2 to 0.4 mm.
Hyphae of the outer wall highly pigmented and globose-angular in texture.
Scattered asci with multiple spores inside, apparently more than 100 ascospores per ascus; these asci show no reaction to Melzer's reagent. Filiform, septate paraphyses with pigmented amorphous material on their surface, which do not protrude above the level of the asci.
Completely spherical, hyaline, small ascospores, with the following measurements of free ascospores:
(2) 2.2 - 2.7 (3.1) × (1.9) 2.2 - 2.5 (2.9) µm
Q = 1 - 1.1 ; N = 40
Me = 2.5 × 2.4 µm ; Qe = 1
Any feedback you may have is welcome.
Thank you in advance.
Best regards
¿Has contemplado el género Sarea?
Un abrazo.
Por supuesto que atendiendo a su microscopía todo encajaba con Sarea, pero resulta que las especies de Sarea que conocía, las asociaba a la resina de coníferas, no a la madera, además de presentar un color anaranjado, he estado hurgando en Index Fungorum y todo parece apuntar a Strangospora pinicola, anteriormente denominada como Sarea pinicola.
Como siempre has dado en el clavo.
Un abrazo.
Red brown color of epithecium is ok for S. pinicola, but chemical reactions are welcome, because there are more than one species :
if K+ purple, ok for S. pinicola
else :
if epithecium N+ purple, it's S. moriformis, else S. deplanata (N= nitric acid)
All the best to you and Enrique,Alain
I didn't think it would be so complicated considering the substrate, and also because all the parameters seemed to perfectly match the literature I've found on *Strangospora pinicola*.
So I retrieved the samples; unfortunately, they had already been through the dryer, and under the microscope I couldn't clearly observe any of the hymenium elements, although there was a clear reaction of these with IKI to a purple color with bluish tones, which might confirm the proposed *Strangospora pinicola*.
Although they're not great quality, I've attached a few images of the observed reaction.
Best regards, Josep.
