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Valley County, Idaho. ~6 air miles west and 2 air miles north of Donnelley, ID. No Business Lookout, along forest service road 185, 3 miles from junction with 245. Granite slopes surrounding fire lookout, and thin sandy soils in saddle between radio tower and lookout. With Artemisia, Pinus contorta, Pinus albicaulis, Abies lasiocarpa and Picea engelmannii.

Can anybody let me know what the difference between T. diplomenziesii and T. menziesii is? I am using Jepson and they just mention that T. menziesii is "morphologically similar" but found from Central OR northward.

This is a dwarf subalpine form of Adiantum aleuticum, discussed in the past as a possible undescribed variety, and known only from a small number of sites in the Seven Devils Mountains of west-central Idaho. The site is a subalpine talus field at an elevation of about 8000 ft. The plants show some resemblance to the serpentine form of Adiantum aleuticum, but the rock is not serpentine. The bedrock is mapped here as metamorphosed sedimentary and volcanic rocks associated with the Seven Devils Group of the Wallowa Terrane. As such it is possible that there is some unusual chemistry to these rocks but it would take input from a geologist to make a more specific determination.