Rosette-like clump of erect, once-pinnate fern fronds
Clump of ferns showing fresh light green fronds
Dense clump of sword-shaped fronds on the forest floor
Large fern clump growing on a forest bank beside an observer
Clump of ascending fern fronds on a forest floor
Underside of fertile frond pinnae bearing sori
Underside of a fertile frond showing pinnae and sori
Scaly stipes arising from the fern crown
Close-up of pinnae along a fern frond rachis
Scaly stipe of a developing fern frond
Underside of a fertile frond showing rows of sori
Scaly stipe bases at the fern crown
Underside of fertile fern pinnae showing sori
Underside of fern pinnae showing rows of sori
Base of fern showing scaly stipes emerging from crown
Underside of a fertile fern frond showing sori
Base of clump showing scaly stipes rising from the crown
Upper surface of pinnae showing embossed sori
Underside of a fertile frond showing rows of sori
Native to Alaska, British Columbia, California, Idaho, Mexican Pacific Is., Mexico Northwest, Montana, Oregon, South Dakota, Washington; introduced into Belgium, Germany, Great Britain, Ireland, Netherlands, Pennsylvania (source: POWO). Flora of the World documents 3 occurrences across 1 country.
As seen in 3 occurrences, in Idaho, Washington and California, United States: Plants grow in clumps on the forest floor in Idaho and Washington, and on a forest bank in California. The once-pinnate fronds are arranged in erect, ascending, or spreading vase-like rosettes, with scaly stipes rising from the crown and rachises bearing toothed green pinnae. On the fertile frond undersides, circular sori with peltate indusia are arranged in rows on either side of the pinna midribs, appearing pale green to pale greenish-yellow when unripe and maturing to brownish or brownish-orange.
Sori circular, covered with peltate indusia and arranged in rows along both sides of the pinna midribs; pale green to pale greenish-yellow when unripe, maturing to brownish-orange.
Location
United States, California, Marin (Mill Valley)
37.8925, -122.568611
Location Remarks
Muir Woods National Monument. Take Highway 101 to the Highway 1/ Stinson Beach Exit. Follow the signs to Muir Woods.
Collectors
No collectors specified
Location
United States, Idaho, Valley (Cascade)
44.158, -116.118361
Location Remarks
Highway 55 c. 10 km north of the bridge at Banks. Mixed conifer forest along the N. Fork Payette River.
Collectors
No collectors specified
Location
United States, Washington, Grays Harbor (Quinault)
47.466111, -123.846111
Location Remarks
Quinault Rain Forest, trails in the coniferous forest southeast of Lake Quinault Lodge.
Collectors
No collectors specified
