Hello everybody, I need help with the determination of this Peziza.
Spooner's key leads me to Malvipezia (Peziza) howsei, but this key does not contain many species such as P. emileia etc.
Collected at the beginning of September, in a warm mixed, mainly deciduous forest on the humous calcareous, slightly eutrophic soil under Tilia and Juglans nigra, altitude cca 300 m, .
Apothecia gregarious in a loose group, up to 60 mm on average, mostly undulate, fawn with slightly violaceous tinge.
Asci with croziers, amyloid reaction WTR type.
Ascospores with Me = 19.8 × 9.1 µm, Qe = 2.2; with 2 LBs; verrucose, warts regular, isolated, punctate or short ridges, usually more pronounced at poles. The paper "Morphological and molecular study of Peziza emileia and P. howsei, two distinct taxa" by Medardi et al. defines the different ornamentation of spores quite clearly.
Excipulum is the problem. This cited paper, and other resources, of course, states a two-layered medullary excipulum, but I can't see 2 clearly defined layers. It seems to me, there are globose cells in the upper part of tissue, but in the lower part I can see some fusoid or pyriform, globose and angular cells, but no textura intricata or something like that. The subhymenium is supposed to be made up of cells of the text. intricata too, but I see such a structure again that I would not normally consider to be an intricata.
Thanks for help.
Marek