Hello Nico! Although I am still in terrrrrible rush...I just wanted to respond quickly. To me it is normal Helvella latispora. Macroscopically would perfectly fit with macro-structures (esp. margin that is inrolled in maturity). The stipe context should be more or less solid. My H. latispora has significantly lesser spore Q values than H. elastica and has spores normally up to about 20,0 ym long and 12,5-14,8 ym diam (which would also nicely fit your collection). Longer spores are real outlayers when statistically suficient measurments are taken from living spore prints. It is further cyto- & histochemically rather different from H. elastica which must place it rather distant from it phylogenetically (this will be soon published by me & Ivana I hope). Cordially,
Neven

Thank you Neven.
I do not recognize H. latispora in my collection, but I do not reject this hypothesis. The previous collections of H. latispora that I studied were always a bit furfuraceous (with small chains emerging from the ectal excipulum) and the outside colour were white. The ecology is also different.
You can see a good photograph, page 43, in my article published in Bulletin mycologique et botanique Dauphiné-Savoie #199.
It's interesting to note that on the Italian forum Acta Fungorum, Mario Filippa think my collection could be the same fungus that he names H. stevensii.

Hi again...!

As I'm not at home at the moment I cannot check some details but as long as I remember I considered H. stevensii to be the syn. of H. latispora. Had a number of transitions between hairy and smooth vestiture on both pileal and/or stipal exc. surface. Also the exc. surface colour may vary considerably (due to quantity and extent of diffuse cell pigment....

But - I will check back later (soon I'll be +/- home and finally out from extra rush for a week or two).

Neven