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Ascobolus cf. foliicola
Zuzana Sochorová (Egertová), 28-06-2022 20:12
Zuzana Sochorová (Egertová)Hello,
I repeatedly collect a foliicolous Ascobolus in one locality in Moravia (200 m a.s.l., on decaying, very wet leaves of Alnus and Salix, close to the Morava river).
First I identified it as Ascobolus foliicola, but now I am in doubts whether the identification is correct.
The features highlighted by van Brummelen as important for distinguishing A. foliicola and A. denudatus are the following ones:
* stalked receptacle (foliicola) vs. sessile receptacle (denudatus) - I would consider my apothecia rather sessile or only shortly stipitate
* margin permanently furfuraceous (foliicola) vs. soon smooth (denudatus) - here my find fits better A. denudatus
* excipular warts consisting of subglobose and pyriform cells (foliicola) vs. only subglobose cells (denudatus) - I can see a few pyriform cells, but the majority is subglobose

Ornamentation of ascospores clearly fits better A. foliicola, at least when judging from van Brummelen´s illustrations.. Their dimensions are (18.1)18.5-20 (20.4) × 9.7-10.9) µm
Q = 1.8 -1.9
Me = 19.2 × 10.3 µm
How would you determine it?
Zuzana
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Zuzana Sochorová (Egertová), 28-06-2022 20:13
Zuzana Sochorová (Egertová)
Re : Ascobolus cf. foliicola
Wall of asci is not blue neither in IKI nor in MLZ, but the content of immature asci as well as cells of ectal excipulum turns violet in IKI.
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Zuzana Sochorová (Egertová), 28-06-2022 20:17
Zuzana Sochorová (Egertová)
Re : Ascobolus cf. foliicola
more
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Till Lohmeyer, 29-06-2022 10:05
Re : Ascobolus cf. foliicola
Good morning, Zuzana - 

comparing van Brummelen's illustrations 40 c (foliicola) and 41 (denudatus) you will note a remarkable difference: The spores of foliicola look like "drawn by a trembling hand", those of denudatus don't. Thus, I'm pretty sure, your fungus should be A. foliicola. 

Best regards from Bavaria
Till
Zuzana Sochorová (Egertová), 29-06-2022 17:48
Zuzana Sochorová (Egertová)
Re : Ascobolus cf. foliicola
Hello Till,
thank you very much!
Zuzana
Nicolas VAN VOOREN, 30-06-2022 16:00
Nicolas VAN VOOREN
Re : Ascobolus cf. foliicola
Hello.
A. denudatus can be excluded because its ascospores always show some pustules.
In the other hand, I do not recognize A. foliicola I used to collect, but I do not have any other idea.
Zuzana Sochorová (Egertová), 01-07-2022 18:14
Zuzana Sochorová (Egertová)
Re : Ascobolus cf. foliicola
Thank you :-)