''Sceptridium oneidense'', the blunt-lobed grapefern, is a fern species in the family

Ophioglossaceae Ophioglossaceae, the adder's-tongue family, is a small family of ferns. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), it is the only family in the order Ophioglossales, which together with the Psilotales is placed in the sub ...

Description

The leaf blades of ''S. oneidense'' are ternately compound. The spores mature in late fall in panicles that rise above the sterile fronds.

Taxonomy

At first, ''S. oneidense'' was considered a variety of ''

Botrychium dissectum ''Sceptridium dissectum'' is a common fern (or fern-ally) in the family Ophioglossaceae, occurring in eastern North America. Like other plants in this group, it normally only sends up one frond per year. It has long been the subject of confusi ...

'', then a form of it, then possibly a hybrid species. However, after a more detailed study by Wagner in 1961, it was considered its own species.

Distribution and habitat

''S. oneidense'' grows in moist woodlands in eastern United States and Canada from New Brunswick to Ontario and south to North Carolina. In Canada, it is a relatively rare species, usually only found in large groups of ''

Botrychium obliquum ''Sceptridium dissectum'' is a common fern (or fern-ally) in the family Ophioglossaceae, occurring in eastern North America. Like other plants in this group, it normally only sends up one frond per year. It has long been the subject of confusi ...

''.

References

Ophioglossaceae Ferns of the United States Ferns of Canada Plants described in 1901 {{fern-stub