Osmunda claytoniana interrupted fern; (flowering fern)* Osmundaceae OSCL2; Bx, pb; Q, cu; R, an, cp, ev, d, gb, h, r, sv, w; Possibly also planted in restoration sites.


Osmunda claytoniana.Robin Moran.www.plantsystematics.org.jpg

Osmunda claytoniana.Robin Moran.www.plantsystematics.org (Accessed 4/15/2016)

Osmunda claytoniana is a fern from the end of a stout, fibrous rhizome. 

Leaves in a large rosette, to 1.2 m tall, to 30 cm wide, once pinnate, leaflets (pinnae) deeply lobed, lobes shorter and appearing coarser than those of O. cinnamomea, tips blunt;

Spore cases on fertile pinnae 1-5 pairs, along middle part of leaf stalk, 6 x 2 cm, much smaller than green, pinnae above and below, red-brown, soon withering. Not much used by wildlife. 

Wetland status: FAC. 

Frequency in NYC: Occasional. 

Origin: Native to NYC. 

Osmunda claytoniana (interrupted fern).MBGargiullo. close-up.Nova Scotia, Canada.8/1/2016

Osmunda claytoniana (interrupted fern). MBGargiullo. close-up leaves. Nova Scotia, Canada.8/1/2016

Habitat: Moist upland woods, sub-acid to neutral soil. Usually distinctly upland of O. cinnamomea populations. 

Notes: A host of the white-spored fir rust Uredinopsis osmundae (a fir-fern rust, Basidiomycotina) (Sinclair et al. 1987; Bailey et al. 1976).*Not actually flowering. A common name for the family Osmundaceae or ferns with showy sporangia.