Basis for Former Listing
At this time, the existence of Cheilanthes lanosa in Minnesota is a matter of conjecture. The only documentation that bears on this question is a 19th Century herbarium specimen labeled "Dalles of the St. Croix". That description could place the location in Minnesota or Wisconsin. A fern specimen collected in Winona County, Minnesota in 1991 was initially thought to be this species, but was later revealed to be the closely related species C. feei.
If C. lanosa were actually discovered in Minnesota, it would likely be on dry, sunny limestone outcrops on steep, south or east-facing slopes in the southeast corner of the state. Any activity that would alter the growing conditions in such a sensitive habitat could threaten the survival of an indigenous population.
Basis for Delisting
It is possible that authentic C. lanosa does occur in the state but the evidence at this time is too tenuous to justify it remaining on the state endangered species list. Cheilanthes lanosa was delisted in 2013.