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2,243 species in Mammoth Cave National Park
Tubifera ferruginosa
Tuckermanopsis americana
Tuckermanopsis ciliaris
Tylozygus geometricus
Ululodes quadripunctatus
Urola nivalis
Uromyces hedysari-paniculati
Uromyces seditiosus
Usnea subfloridana
Utterbackiana suborbiculata
Vaccinium corymbosum
Vaccinium pallidum
Vaejovis carolinianus
Valgus canaliculatus
Vandenboschia boschiana
Ventridens gularis
Vernia verna
Veronica serpyllifolia
Veronica sublobata
Verrucaria nigrescens
Vertigo gouldii
Viburnum prunifolium
Vicia villosa
Viola communis
Viola labradorica
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