Morphological examination of the mushroom is unreliable to know a mushroom identity. Best and most accurate way is to take it back to your lab, extract its DNA and do some molecular works to identify it.
If you think that it might belong to Coprinopsis genus, do some literature search and design a suitable primer, run a PCR to confirm its identity!
Zx Chong , Thanks or your contribution, i know it is difficult to rely on the morphology to identify mushrooms and i have already did the molecular analysis and now i'm working on the ITS-based identification. i just need a general comment based on the photo.
Jawad K. Abood Al-Janabi , Thanks very much, unfortunately i have not as i have collected this sample two years ago.