Growing from the base of roots in Larch wood
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
The stipe does not look dark brown and velvety , the way I would expect for P.atrotomentosus. Could it perhaps be P. involutus? The pine litter would suggest P.a. but it looks more like P.i. to me.
All I could think is maybe it was because it was a newly emerged one,as there were no old ones around to compare.I went for that as you say because of the pine litter as P.involutus was broad leaved.
I don't know either species well enough to judge. Sorry I can't help.
Lat/Lng: 55.0565, -2.2208
OS grid ref: NY859735