03-02-2026 20:44
Zetti MarioWhen I first saw this white mould on an Agaricus s
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Lothar Krieglsteiner
.. 20.7.25, in subarctic habital. The liverwort i
02-02-2026 21:46
Margot en Geert VullingsOn a barkless poplar branch, we found hairy discs
02-02-2026 14:55
Andgelo Mombert
Bonjour,Sur thalle de Lobaria pulmonaria.Conidiome
02-02-2026 14:33
Andgelo Mombert
Bonjour,Sur le thalle de Peltigera praetextata, ne
31-01-2026 10:22
Michel Hairaud
Bonjour, Cette hypocreale parasite en nombre les
02-02-2026 09:29
Bernard CLESSE
Bonjour à toutes et tous,Pour cette récolte de 2
01-02-2026 19:29
Nicolas Suberbielle
Bonjour, Marie-Rose D'Angelo (Société Mycologiq
31-01-2026 09:17
Marc Detollenaere
Dear Forum,On decorticated wood of Castanea,I foun
Found on cattle dung.Ascomata: scattered, semi-immersed, subglobose.
Asci: 78-115x13-16 um; 8-spored; clavate, long stipitate.
Spores: (21.5-) 23.8-25.7x5.2-6.1 um; transversly septate; deeply constricted; germ slit parallel; gelatinous perisporium absent. Terminal cells are longer than middle ones. Middle cells barrel-shaped, wider than long and usually equal in size.
The examined sample is similar to Preussia terricola Cain. But, I have doubts about the size and shape of the ascospores.
I would be grateful for your ideas and comments.
Regards,
Yulia
no, this is not Preussia terricola which has spores with mid-cells longer than broad.
The only Preussia with mid-cells broader than length I know is Preussia typharum.
But the spores of your found seems a little bit too small for this species!
I know it with spores mostly 28-32 x 7-9 but also 26-30 x 6-7 µm.
Maybe that there is an error in your measurement?
Or you did find a small spored variation?
Or a new species which should be called "Preussia minitypharum".;)
Best regards, Norbert
I did'nt know this genus "Preussia". the photos are very nice to observe.
Does somebody can provide me a key for the genus Preussia ?
Looking for it on the web I found somewhere a synonymy with certain species of "Sporormiella",
are the 2 genus synonymous ?
Thanks in advance.
Michel
michrimbaud@aol.com
Preussia-Cain-Can.-J.-Bot.-1961-0001.pdfVery interesting documents.
You're right. At first I also thought about Preussia typharum. But the spores is too small. I also doubted my measurements. I took measurements several times, checked the calibration. My measurements are correct. I'm also confused by the shape of the middle cells. I like the idea with a new species :)
Regards, Yulia.
Thank you! Your ideas and comments are also interesting. I also assume that in Preussia / Spormiella the size and shape of the spores may vary depending on maturity. But how much they change is a question. Will the cells change from barrel-shaped or hemispherical to cylindrical? I'll try to revise my samples a little later. I think it is necessary to study the spores in the later stages of maturity.
Regards, Yulia.
The question of Preussia / Sporormiella is quite debatable.
In recent years, in articles based especially on the results of phylogenetic analysis, these two genera have been synonymising. A number of researchers do not accept this because morphologically these taxa are quite different.
I have a number of works on these two genera. There are articles with keys or just with illustrations and diagnoses. One of the main devotees of Preussia is the work of Cain, which was attached by Norbert. If you are still interested in other works, then write to me, I will be happy to help.
Regards, Yulia.
I've just got the work of Cain for Preussia, and I have other papers for Sporormia and Sporormiella.
So I don't need others for the moment.
Thank you for your proposal, this is kind of you.
Michel R