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首页> 美国政府科技报告 >American Hart's Tongue (Asplenium scolopendrium var. americanum). Synonym: Phyllitis scolopendrium var. americana American Hart's-Tongue Fern, Recovery Plan
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American Hart's Tongue (Asplenium scolopendrium var. americanum). Synonym: Phyllitis scolopendrium var. americana American Hart's-Tongue Fern, Recovery Plan

机译：美国哈特的舌头（asplenium scolopendrium v​​ar.americum）。同义词：phyllitis scolopendrium v​​ar。美国美国Hart's-Tongue Fern，恢复计划

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Current Status: Asplenium scolopendrium var. americanum is federally listed as a threatened species. It is currently know from 21 locations in the United states (2 in Alabama 1 in Tennessee. 6 in Michigan, and 12 in New York). The species also occurs in Ontario, Canada. Habitat requirements and Limiting Factors: This rare fern is typically found growing in close association with dolomitic limestone. In the southern part of its range it is found only in entrances to pit caves. The entrance areas to these caves provide the humidity and moisture levels that are associated with the populations found at more northern latitudes. It is threatened throughout most of its range by trampling, logging, and development within and near its habitat. Recovery Objective: to delist the species. Recovery Crieria: American hart's-tonuge will be considered to delisting when there are at least 15 self-sustaining populations in the United States that are protected to such a degree that the species no longer qualifies for protection under the Endangered Species Act. Actions Needed: (1) Protect know populations; (2) conduct needed biological studies: (3) implement management. if needed (4) protect genetic material and reestablish populations. if necessary: and (5) conduct enforcement and education programs and monitor recovery progress.

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