''Onnia tomentosa'' is a species of fungus in the family Hymenochaetaceae commonly known as the woolly velvet polypore. It is frequently found in coniferous forests at higher altitudes, often growing in large groups, rather rare at lower altitudes. It is a plant pathogen, and causes tomentosus root rot, primarily in spruce.
Similar species: Hymenochaetales
Uploaded Apr 5, 2021. Captured Sep 7, 2020 07:43 in 5 East St, New Milford, CT 06776, USA.