Calciums role as a supplement in higher fungi...all these are worth reading. 
https://pmc.ncbi.nlm.nih.gov/articles/PMC10052545/

https://pdfs.semanticscholar.org/d7a6/455067009e5fea367b19f4e788a281baf674.pdf#:~:text=with%20addition%20of%20calcium%20carbonate,of%20calcium%20carbonate%20affected%20chemical