Rugulose Grapefern

Sceptridium rugulosum

Sceptridium rugulosum is a fern in the family Ophioglossaceae.

Sceptridium rugulosum resembles S. dissectum (dissected grapefern) and S. multifidum (leathery grapefern), with which it commonly grows; however, its leaf emerges from the ground in late May, before the former and after the latter. The sterile deltoid-shaped leaf blade averages 4-8 cm (1.6-3.1 in.) long, with the petiole more or less the same length (shorter in sun forms and longer in shade forms). Unlike the rounded lobes of the leaf of S. multifidum, the leaf of S. rugulosum has angular lobes, mostly 2-5 mm (0.08- 0.20 in.) wide, with the edges coarsely and irregularly toothed. The marginal teeth are dentate (wide-based, squarish and outward-pointing), as opposed to the serrate (narrow, sharp, forward pointing and saw-like) teeth of S. dissectum forma obliquum. The leaf of S. rugulosum may maintain its green color, while the leaf of S. dissectum can turn a drab reddish color and then turn bronze-colored in autumn.
Sceptridium rugulosum Growing at the edge of an old field. Botrychium rugulosum,Fall,Geotagged,Rugulose Grapefern,Sceptridium rugulosum,St. Lawrence Grapefern,United States,fern,grapefern


Trophophore stalk 2 to 15 cm, 1--2.5 times length of trophophore rachis; blade green, finely rugulose and convex distally, 2--4-pinnate, to 15 × 26 cm, somewhat herbaceous. Pinnae to 9 pairs, usually approximate, horizontal to ascending, distance between 1st and 2d pinnae not or slightly more than between 2d and 3d pairs, divided to tip. Pinnules obliquely and angularly trowel-shaped to spatulate, margins usually denticulate, apex acute, venation pinnate. Sporophores 2-pinnate, 1--2 times length of trophophore
Sceptridium rugulosum Growing in an old field slowly being encroached upon by trees. Botrychium,Botrychium rugulosum,Geotagged,Rugulose Grapefern,Sceptridium,Sceptridium rugulosum,Spring,United States,fern,grapeferns


Sceptridium rugulosum (W.H.Wagner) Skoda & Holub 1996
Botrychium rugulosum W.H.Wagner 1982
Botrychium multifidum (S.G. Gmelin) Ruprecht forma dentatum R.M. Tryon
Botrychium ternatum auct. non (Thunb.) Sw. 1801

The name "rugulosum" (Rugulose Grapefern) refers to the tendency of the segments to become more or less wrinkled and convex. Also known as the St. Lawrence Grapefern after its occurrence in the vicinity of the St. Lawrence River watershed in Ontario, Quebec, New York, and Vermont.
Sceptridium rugulosum Sceptridium rugulosum Geotagged,Rugulose Grapefern,Sceptridium rugulosum,Spring,United States


USA: Connecticut, Michigan, Minnesota, New York, Vermont, Wisconsin
Canada: New Brunswick, Ontario, Prince Edward Island, Quebec

Reports from Connecticut and Prince Edward Island are likely false reports.


Global Status: G3
US Status: N3
Canadian Status: N2
Minnesota, Wisconsin: Special Concern
New York: Endangered


Low and moist habitats in brushy or grassy areas and in open forested areas. Sandy fields and barrens, persisting in young forests.


By spores


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SpeciesSceptridium rugulosum