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Preussia terricola ?
Yulia Lytvynenko, 22-07-2020 14:06
Yulia LytvynenkoFound 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

  • message #64298
  • message #64298
Michel Delpont, 22-07-2020 17:13
Michel Delpont
Re : Preussia terricola ?
Good evening Yulia!

R.F.Cain gives spores quite variable in shape for P. terricola; those of your fungus may lack a little maturity and are observed in asci. For the measurements they are in the correct range. Maybe you could check the germ slots to confirm.

Michel.
Norbert Heine, 22-07-2020 17:40
Norbert Heine
Re : Preussia terricola ?
Hello 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

Michel RIMBAUD, 22-07-2020 18:49
Re : Preussia terricola ?
Hello,
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
Michel Delpont, 22-07-2020 20:15
Michel Delpont
Re : Preussia terricola ?
Exact Norbert, I had not seen the intermediate cells which lack maturity and are still inside the asci.

Michel.
Norbert Heine, 22-07-2020 21:20
Norbert Heine
Re : Preussia terricola ?
Hello Michel R.,

I think that Preussia and Sporormiella are two different genera.

For example the fruitbodies of Preussia are cleistocarp and they have typical asci.

"Does somebody can provide me a key for the genus Preussia?"

The best key is from Roy F. Cain (1961). Here it is.

Norbert
Michel RIMBAUD, 23-07-2020 08:14
Re : Preussia terricola ?
Thank you Michel.D and Norbert.
Very interesting documents.
Yulia Lytvynenko, 23-07-2020 10:48
Yulia Lytvynenko
Re : Preussia terricola ?
Dear Norbert!
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.
Yulia Lytvynenko, 23-07-2020 10:53
Yulia Lytvynenko
Re : Preussia terricola ?
Dear Michel!
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.
Yulia Lytvynenko, 23-07-2020 11:06
Yulia Lytvynenko
Re : Preussia terricola ?
Dear Michelle R.
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.
Michel RIMBAUD, 23-07-2020 15:20
Re : Preussia terricola ?
Hello 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