 The life history does not differ from that of "Peronospora", the genus that "Hyaloperonospora" species used to be classified under.It begins as sporangia, which are small spore-like structure, and when it lands next to a leaf stoma, it germinates a germ-tube.The germ tube enters the leaf cell creating a haustorium, which allows the mould the uptake nutrients from the leaf.