As to species:
Probably Cortinarius subalpinusor or Cortinarius clandestinus
A comment on Mushroom Observer indicates these may be the same species
May also be Cortinarius cotoneus
which may or may not be the same as C. subalpinusor and C. clandestinus
see references given below:
found 3/19/15 on Mt. Hood at about 3000 ft.
Growing in the duff on side of trail under Doug Fir
Spore print is brown or redish brown
there is a ring on the stipe
stipe above the ring is a lighter color
Note: Dick B. said:
"The thin jagged veil remnants left at the lower edge of the white area is common on mushrooms with a fibrillose veil.
A membranous veil would usually leave a straighter remnant.
I would try to find fibrils left from the remnants of the cortina,
if colored by the spores they should be easy to see.
The reddish brown spores would usually indicate Cortinarius
but some times Hebeloma spores are a little to reddish also.
The stipe is solid and fibrous
The spores are brown or redish brown
The spores are nearly globose
5 to 6 by 6 to 7 microns