Abstract
A description is provided for Diderma fallax, a myxomycete commonly observed on dead branches and/or twigs in the litter of Apiaceae, Cytisus sp., Gramineae [Poaceae], Prunus spinosa and Vaccinium myrtillus. Some information on its interactions and habitats, economic impacts, infraspecific variation, dispersal and transmission, and conservation status is given, along with details of its geographical distribution (Morocco, Canada (British Columbia), USA (California, Colorado, Kansas, Montana, New Mexico, Oregon, Utah, Washington, Wyoming), Chile, Philippines, Russia (Khanty-Mansi Autonomous Okrug), Austria, France, Germany, Italy, Romania, Russia (Karachay-Cherkess Republic, Tver Oblast), Spain, Sweden, Switzerland, and UK).