was made in a grassy area underneath an apple tree. B/R/B do not mention the KOH stained context change to orange in the NA bolete book account. Maybe my collection represents a variety of this species?

Or perhaps chemical reactions vary regionally? I have noticed that chemical reactions for some of my collections of boletes – that otherwise key out very well – do not always match up with those reported by B/R/B.

Also, it is my understanding that chemical reactions are most prominent when the material is very fresh. Often it is the case that a collection of mine may be several hours old before I get it home and apply a chemical.

may be a good match. Application of NH4OH turns blue stained context to green and then to orange. If it is not apparent in the photos, the stipe is not reticulated.

Blued context did not turn orange as was reported in this observation: http://mushroomobserver.org/70431?q=Gpya