1) Fungus genus 2) Genus peronospora 
Peronospora is a genus of plant pathogens, belonging to the class of water moulds. Water moulds are not true fungi (Eumycota) since they belong to the kingdom of chromalveolates. There are about 75 species in the genus, mostly specific to genera or families of herbaceous dicotyledonous plants. One of the best known Peronospora species (Peronospora...
Peronospora is a genus of algal fungi, containing a number of species which are all parasitic as moulds on plants. The branched single-celled mycelium infests the tissues of higher plants, frequently causing death.
[n] - genus of destructive downy mildews
genus Peronospora noun genus of destructive downy mildews