Zygospores are
Diploid
Haploid
Polyploid
All of these
Phycomycetes (Algal fungi) -
-Zygospores are diploid as it is formed by the fusion of two haploid gametes which is either morphologically similar (isogamous) or morphologically dissimilar (anisogamous/oogamous).
-Zygospores are formed in phycomycetes and they are diploid.