General: Deciduous perennial arising in vase-like clusters or singly.
Leaves: Triangular to oblong-triangular, 20-70 cm long, 10-60 cm wide, sparsely glandular on rachis and lower side of pinnae, 2- to 3-pinnate, the lowest pinnae longer than the upper ones, leaf outlines triangular.
A shade-tolerant, submontane to subalpine, circumpolar fern (transcontinental in North America). Occurs on fresh to very moist. nitrogen-medium soils within boreal, cool temperate, and cool mesothermal climates; its occurrence increases with increasing precipitation. Common and occasionally dominant in coniferous forests on water-shedding and water-receiving sites; often inhabits decaying wood. Associated with Blechnum spicant, Polystichum munitum, Rhytidiadelphus loreus, and Vaccinium alaskaense. Characteristic of friable Mor and acidic Moder humus forms.
Dryopteris assimilis S. Walker Dryopteris dilatata auct. non (Hoffm.) A. Gray Dryopteris dilatata subsp. americana (Fisch.) HultΘn Dryopteris spinulosa subsp. assimilis Dryopteris spinulosa var. dilatata auct. non (Hoffm.) Underw.
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC:
Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for
Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
2021-01-19 8:05:23 PM
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