PROTECTING WISCONSIN'S BIODIVERSITY

 
 
   
 
Scientific Name Common Name Global Rank State Rank Federal Status WI Status

Blunt-lobe Grape-fern (Sceptridium oneidense)

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Photo by Scott Milburn

 

Counties with Mapped NHI Occurrences

Blunt-lobe Grape-fern (Sceptridium oneidense), a Wisconsin Special Concern plant, is found in moist, often acid depressions in damp open forests. The optimal identification period for this species is late-June through September.

Botrychium dissectum var. oneidense, Botrychium multifidum var. oneidense, Botrychium ternatum var. oneidense

 
 
 

Blunt-lobe grape-fern has broadly triangular, 8-19cm long x 6-15cm wide, fronds, 2-4 times pinnate with coarse, entire to shallowly lobed, ovate pinnae. The terminal 1/2-1/4 of pinnae are usually undivided, though may be lobed. The fronds are produced in the spring and last until following spring, overwintering as a leathery green blade. The fertile portion is an erect spike 14-38cm long and slightly to many times longer than the sterile portion, is pinnately branched at its apex, and each branch and branchlet bears 2 rows of sporangia not or only slightly embedded in the branch.

Its fronds are broadly triangular, 2-4 times pinnate with shallowly lobed, ovate pinnae (broader than the lanceolate pinnae of B dissectum). B multifidum and B rugulosum have more dissected blades. B dissectum is bronze in color over winter.

Rhizomatous. Fruiting occurs September through mid-October.

Perennial. The optimal identification period for this species is late-June through late-September.

Associated species include Acer rubrum, A saccharum, Tilia americana, and Rumex acetosella.

Blunt-lobe grape-fern is found in moist, often acid depressions in damp open forests.

Avoid known individual plant locations and conduct operations elsewhere when they are least likely to cause damage. Ideally, this would involve frozen, snow-covered ground. However, in areas of the state where frozen conditions are unreliable, very dry soils late in the growing season might be the best available alternative. Consult with a biologist, if needed.

Avoid broadcast spraying of herbicides and use care with spot spraying.

Avoid site preparation that heavily disturbs herbaceous ground layer and soil, including bulldozing and furrowing, as well as grubbing and stump removal.

Avoid direct disturbance to sensitive microsites such as seeps, cliffs, and moss-covered boulders.

This species requires shaded habitat conditions, maintain high forest canopy cover.

Minimize disturbance to hydrology, including soil disturbance from rutting.

Avoid rapid and dramatic reductions in canopy cover and, basal area, in wet areas to reduce risk of swamping.

Maintain thick duff layer if possible. Minimize spread of invasive species including earthworms.

Species of Greatest Conservation Need (SGCN) are associated with habitats (or natural communities) and places on the landscape. Understanding relationships among SGCN, natural communities and ecological landscapes help us make decisions about issues affecting SGCN and their habitat and how to respond. Download the Wildlife Action Plan association score spreadsheet to explore rare species, natural communities and ecological landscape associations

Conservation actions respond to issues or threats, which adversely affect species of greatest conservation need (SGCN) or their habitats. Besides actions such as restoring wetlands or planting resilient tree species in northern communities, research, surveys and monitoring are also among conservation actions described in the Wisconsin Wildlife Action Plan because lack of information can threaten our ability to successfully preserve and care for natural resources.