Dryopteris carthusiana (Villars) H.P. Fuchs. Common name: Spinulose Woodfern, Toothed Woodfern. Phenology: Jun-Oct. Habitat: Acidic, organic-rich bogs, swamps, less frequently in moist rocky ravines, rich forests, and sloping rock outcrops. Distribution: Circumboreal, in North America ranging from n. QC west to YT, south to NC, SC, ne. GA, TN, AR, NE, w. MT, and WA.

Origin/Endemic status: Native

Taxonomy Comments: This species is a fertile allotetraploid derived from hybridization of Dryopteris intermedia and "Dryopteris semicristata", a hypothetical species which may now be extinct. Its chromosome complement is symbolized IISS. The triploid backcross Dryopteris ×triploidea (Dryopteris carthusiana × intermedia, with chromosome symbolized IIS) is frequent in areas with both parents present.

Synonymy ⓘ: = Ar, C, Can, FNA2, Il, K4, Mo1, NE, NS, NY, Pa, Tn, Va, W, Montgomery & Paulton (1981); Polypodium carthusianam Vill.; = Dryopteris austriaca (Jacq.) Woyn. ex Schinz & Thell. var. spinulosa (O.F.Müll.) Fiori — G; = Dryopteris spinulosa (O.F.Müll.) Watt — GrPl, RAB, S13, Sf, Tat, WV; = Dryopteris spinulosa (O.F.Müll.) Watt var. spinulosa — F; > Dryopteris carthusiana var. carthusiana — POWO. Basionym: Polypodium carthusianam Vill. 1786

Links to other floras: = Dryopteris carthusiana - FNA2

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACW
• Eastern Mountains and Piedmont: FAC
• Great Plains: FACW
• Midwest: FACW
• Northcentral & Northeast: FACW

Heliophily ⓘ: 3