sentences:  The early stage, a milder chlorosis, is found on the on abaxial face, but if the white rust is allowed to thrive, it can blister and be visible on the adaxial surface as well.Like all the other species in its genus, "Albugo occidentalis" is an oomycete.The survival structure is an oospore, which is the result of the karyogamy of two haploid gametes (the oogonium and antheridium).