Purple-bloom Russula - Russula mariae
Cap was deep purple with a white bloom and striate margins. When the bloom was rubbed off, the cap was red underneath. Stipe and gills were white.
There were 2 mushrooms - one large and one small - whose caps had fused. The mushroom(s) were growing with their caps perpendicular to the ground. Spotted in a coniferous forest.
I'm not completely sure of the species ID, but am working on getting it confirmed.
This gorgeous Russula is common under oaks in eastern North America. It has a purple cap that is covered with a white dusting or "bloom," and its stem is flushed with a paler version of the cap color. The spore print is cream colored to pale yellow, and the taste is mild or slightly oily and unpleasant.