Identificaciones de sigridjakob

Abundant flushes beneath Betula sp.
Reddish brown ”scabers” on mature stipes.
Stipe context: reddish at base.
Taste: slightly sour/citrus.
Harvested multiple specimens.
Spore printed a cap directly on a glass slide.
Spore print: olive brown(pale green cast at angle).
Mounted spore printed slide in KOH.
Spores: Fusiform(tapered at each end), long smooth, medium/large, yellow in KOH.
Spread the majority of specimens beneath hardwoods around our neighborhood to propagate.
Dehydrated 2 sliced specimens for herbarium collection/genetic record.
My coinciding Mushroomobserver observation below-

https://mushroomobserver.org/532763?q=1pEcf