MYXO MYCETES (Mycetozoa, Myxogastrales) The slime-moulds are a group thoroughly adapted to wind dispersal. Some, such as Reticularia, merely expose a dry, powdery spore-mass on a cushion raised above the substratum. Others, such as Stemonitis and Trichia, expose small, dry spore-masses on stalks at most a few millimetres high. The spores are set free by twisting movements of hygroscopic elaters which take place with changes in air humidity (Ingold, 1939), or, in a few species, spores may be removed by eddies from shallow wind-cups.