Camisia carrolli was found to be one of the most abundant mites on Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) in the western Cascade Mountains of Oregon. It occurs at maximum density in the upper portion of the canopy. Five to eight years-old twigs with needles still attached constitute its optimum microhabitat. This mite is mycophagous and probably feeds on pioneer fungi colonizing young twigs. Fungi and other detritus cover it completely and may help it endure drought.