o! Gyromitra esculenta, i know that! I made a post about differences between this shroom and his edible 'synonim' -- morels.
https://peakd.com/hive-166168/@qwerrie/morel-verpa
Gyromitra is not deadly :) it is considered toxic, and indeed in more warm-climate countries, it contains some deadly toxins within, and in our, less warmer climate, they are nice tasty mushrooms without that toxin. weird? absolutely! shrooms are not that simple (well, and they do not pretend to be simple, hehe!)
btw I am from St.Petersburg; we are almost neightbours (well, on the world scale!)
!BEER
Yes practically neighbours, only 345km in between. That's about a 4½ hour drive.
Mushrooms are weird. And they are still very much unexplored territory even in sciences. I wonder what they are going to discover.
btw: believe me or not, but one of FL moderators, @davidgermano, has mushrooms as its science field! if you are curious to ask, you may probably approach him with a question -- what does he doing with shrooms :P