Almost identical, this mushrooms is a synonym of C. cinnamomeus. I have found that the Cortinarius dermocybes tend to be very sensitive to hot water. I used hot tap water which was around 110 degrees and added the ground mushrooms to the water. I did not cook these mushrooms or increase the temperature. I simply let them sit in the water for an hour and it eventually cooled to 85 degrees, strained the dye bath and dropped in the fibers.
Almost identical, this mushrooms is a synonym of C. cinnamomeus.