Hello, 

what was the key character that made you decide for subumbrina? I would be tempted to call both your and the netherlandish collection P. limnaea, but I don't have much experience with other related species. In what altitude did you collect it? 

However, in both Boudier's and Hohmeyer's description the external side of P. subumbrina should be greyish (which reminds me a bit on one those violet Pezizas that turn to wine-brown with age). Boudier describes and illustrates verrucose ornamentation, but he does so for P. badia as well. Here's his description and illustration:
https://www.biodiversitylibrary.org/item/105401#page/179/mode/1up
https://www.biodiversitylibrary.org/item/105017#page/227/mode/1up

Best regards,
Viktorie

Hi Viktorie
Thank you very much for your feedback.
The collection was found in lowland areas.
As I mentioned earlier, I first marked her as P. limnaea.
Recently, however, I studied Peziza which also corresponded to the characteristics of P. limnaea but its ornamentation was more discreet. Comparing the ornamentation, I came across a linked page. The ornamentation seemed so similar to me that I decided to use the Hohmayer key again. I decided to check the compatibility of the features with all similar Peziza and I came to P. subumbrina. However, I didn't have descriptions for her so I couldn't make sure it was her. That is why I asked you for help in obtaining literature.

best regards

Mirek