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This result agrees with their suggestion that drought during the spring unfurling period would be most detrimental to hart's tongue ferns , arresting the development of new fronds.
The unique sites at which hart's tongue ferns occur may provide a buffer from the regional climate allowing the species to persist in an otherwise inhospitable area.
Pdsi is calculated for an entire climate region, for example all of the New York hart's tongue fern colonies are located in New York's climate region 10.
During years with many very wet months understory growth may be too dense, thereby suppressing the growth of hart's tongue ferns due to very low light levels beneath a dense herbaceous layer.
American hart's tongue fern fronds unfurl early in the spring, achieving much of their yearly growth before canopy closure.
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