In tamarack bog with sphagnum and speckled alder.
Tamarack bog at BNP, on hummock. With Rubus hispidus and Thuidium delicatulum (both visible), and speckled lader. Patchy. Not certain on the species, but it has the right general look (but i couldn't do any microscopy to check)
BNP tamarack bog
Growing as a small tree or large shrub in the understory of a wet woods.