Special Concern WDNR and federal regulations regarding Special Concern species range from full protection to no protection. The main purpose of this category is to focus attention on certain species before they become threatened or endangered. Apparently globally secure, though it may be quite rare in parts of its range, especially at the periphery. Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery. Of historical occurrence throughout its range, i.e., formely part of the established biota, with the expectation that is may be rediscovered.
More information is needed.
The definition of the second character of the subrank parallels that of the full global rank. Apparently secure in Wisconsin, with many occurrences. Demonstrably secure in Wisconsin and essentially ineradicable under present conditions. Of historcial occurrence in Wisconsin, perhaps having not been verified in the last 20 years, and suspected to be still extant. Naturally, an element would become SH without such a 20-year delay if the only known occurrence were destroyed of if it had been extensively and unsuccessfully looked for.