 Pigmentation, such as melanin in hyphal walls, along with prolific growth on surfaces can result in visible mold colonies; examples include "Cladosporium" species, which form black spots on bathroom caulking and other moist areas.Many ascomycetes cause food spoilage, and, therefore, the pellicles or moldy layers that develop on jams, juices, and other foods are the mycelia of these species or occasionally Mucoromycotina and almost never Basidiomycota.Sooty molds that develop on plants, especially in the tropics are the thalli of many species.