The dissemination problem combined with rapid evolution resulted in morels varying in their appearance from area to area. Morel types are so variable that nomenclature is in a state of confusion. The largest division is between brown and black morels. However, the browns blend into whites, with yellow or tan morels in-between. The blacks also do not create a sharp break from the browns, as various types of grays are in-between.
Morels are also highly variable in size and shape.
Cylindrical to cone shapes are perhaps the most common. Totally round morels are not uncommon. Pencil shaped morels are more rare. However, they also vary within locations, as shown in the research section. Evolution of Morels.