Cystopteris laurentiana (Weatherby) Blasdell. Laurentian Fragile Fern. Hab: Calcareous cliffs and ledges. Dist: NL west to ON, south to MA, PA, n. IL, and e. IA.
Origin/Endemic status: Native
Taxonomy Comments: This allohexaploid species is derived from C. bulbifera × fragilis. Its genome can be symbolized as BBHHRR.
Synonymy: = C, FNA2, Il, K3, K4, NE, Pa; = Cystopteris ×laurentiana – Shmakov, Batkin, & Vaganov (2018); = Cystopteris fragilis (L.) Bernh. var. laurentiana Weath. – F, G; = Cystopteris tennesseensis Shaver ssp. laurentiana (Weath.) Windham – Windham & Pryer (2022)
Heliophily: 3
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