25-11-2025 14:24
Thomas Læssøehttps://svampe.databasen.org/observations/10490522
25-11-2025 11:03
Mick PeerdemanHi all,One of my earliest microscopy attempts, so
24-11-2025 15:23
Arnold BüschlenHallo, auf einer offenen Kiesfläche am Rande ein
23-11-2025 11:16
Bohan JiaHi, I found small discs growing on dead stem of
21-11-2025 10:56
Christopher Engelhardt
Very small (~0,5 mm) white ascos, found yesterday
Apothecia ca 0.3-0.4 mm diameter; sessile; with cream-coloured hymenium. Excipulum textura angularis. Margin with yellowish hairs(?), ca 40-50 µm long, forming an aggregated mass in which individual components are very difficult to distinguish.
Asci 35-40(-45) x 4-5 µm, 8-spored, with croziers, tips staining blue in IKI.
Paraphyses apparently sparse, narrowly cylindrical, ca 1 µm wide.
Spores 10-14 x 1.5-2 µm, with medium-sized oil bodies (ca 30-40% of spore volume).
I assume it belongs to the Hyaloscyphaceae but I haven't managed to put a name to it. I'd be grateful for any help.
Merci
Marcus
Perhaps this is Psilachum lanceolato-paraphysatum. In that species the medulla often reacts blue in IKI, also the anchoring hyphae.
The apos like to grow near a black ?coelomycete, maybe also in your case.
Zotto
Thanks Zotto.
In many respects my specimen does resemble the collections of Psilachnum lanceolato-paraphysatum that you have described/illustrated in your files. I see that you have images of a collection by Piotr Perz in which the hairs are covered in gel, which seems also to be the case in my specimen.
I'll test the reaction of the medulla to IKI. I'll also have another look at the paraphyses - I think in some cases they were distinctly more lanceolate than the one shown in my photo.
Different descriptions of this species seem to vary in some characters. For example, Raitviir says that asci arise from simple septa whereas other descriptions mention croziers. Spore dimensions also seem to be rather variable.
Marcus
actually Raitviir was in error in several cases. I remember Incrupila aspidii which always had croziers when I saw it.
Zotto
I've been having another look at this specimen.
I was mistaken about the paraphyses. They are lanceolate (not cylindrical), tapered to an acute apex, ca 3 µm wide, exceeding the asci by about 10 µm.
Hairs seem to be narrowly cylindrical, ca 2-3 µm wide, but are very difficult to discern because they are aggregated in a mass.
The medulla appears to be blue in IKI (though I struggled to cut a decent section).
The apothecia are closely associated with a sterile coelomycete/hyphomycete, with brown septate setae, 120-220 µm long.
So Psilachnum lanceolato-paraphysatum seems to be a distinct possibility.
Marcus
Thank you!
Marcus