Dryopteris expansa (C.Presl) Fraser-Jenk. & Jermy, 1977 31% complete

Northern buckler fern

Fern Gaz. 11: 338 (1977)

Data sources

Each value Trefle shows for Dryopteris expansa, with what every source says about it. When sources disagree, the strongest source is shown (how sources are ranked). Values imported before sources were recorded one by one are marked Source not recorded.

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Sourced9 Differs from sources2 Source not recorded9 Not on the record8 Sources: TRY Plant Trait Database, Earlier Trefle data
Field Shown What the sources say
Core
Author (C.Presl) Fraser-Jenk. & Jermy No source recorded
Source not recorded
Bibliography Fern Gaz. 11: 338 (1977) No source recorded
Source not recorded
Phylum Tracheophyta No source recorded
Source not recorded
Rank species No source recorded
Source not recorded
Status accepted No source recorded
Source not recorded
Year 1977 No source recorded
Source not recorded
Descriptive
Common name Northern buckler fern No source recorded
Source not recorded
Observations Subarctic & Temp. Northern Hemisphere No source recorded
Source not recorded
Morphology
Average height 80 cm
  • 80 cm · TRY Plant Trait Database · Measured · 7 observations · 2026-10-09
    TRY 7.0 datasets 116, 164, 174, 178, 500, 918
Sourced
Biological type hemicryptophyte
  • hemicryptophyte · TRY Plant Trait Database · Measured · 10 observations · 2026-10-09
    TRY 7.0 datasets 4, 25, 71, 164, 174, 178, 500, 918
Sourced
Foliage texture empty Not on the record
Growth habit Forb/herb
  • Forb/herb · Earlier Trefle data · Reported · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded
Sourced
Maximum height 115 cm
  • 115 cm · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09
    TRY 7.0 datasets 116, 164, 174, 178, 500, 918
Sourced
Sexuality empty Not on the record
Vegetable false No source recorded
Source not recorded
Phenology
Duration perennial
  • perennial · TRY Plant Trait Database · Measured · 5 observations · 2026-10-09
    TRY 7.0 datasets 4, 25, 164, 178, 918
Sourced
Ecology
Atmospheric humidity 7 / 9 · humid air
  • 7 / 9 · humid air · Earlier Trefle data · Reported · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded
Sourced
Ground humidity empty
  • 6 / 12 · moist (meso-hygrophilous) · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09
    TRY 7.0 datasets 178
Not on the record
Light 3 / 9 · shade
  • 6 / 9 · half-shade to half-light · TRY Plant Trait Database · Measured · 2 observations · 2026-10-09
    TRY 7.0 datasets 178, 489
Differs from sources
Nitrogen fixation empty Not on the record
Ph maximum pH 5
  • pH 5 · Earlier Trefle data · Inferred · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded derived from a Baseflor soil reaction class by the 2022 import, a class not a measurement
Sourced
Ph minimum pH 4.5
  • pH 4.5 · Earlier Trefle data · Inferred · 2026-10-19
    value present before provenance tracking (2022 import), no source recorded derived from a Baseflor soil reaction class by the 2022 import, a class not a measurement
Sourced
Soil nutriments 3 / 9 · poor (oligotrophic)
  • 2 / 9 · very poor (peroligotrophic) · TRY Plant Trait Database · Measured · 1 observation · 2026-10-09
    TRY 7.0 datasets 178
Differs from sources
Soil salinity 0 / 9 · absent from saline soils
  • 0 / 9 · absent from saline soils · TRY Plant Trait Database · Measured · 4 observations · 2026-10-09
    TRY 7.0 datasets 174, 178, 242, 489
Sourced
Usda legacy
C n ratio empty Not on the record
Other
Shade tolerance — Not on the record
Soil ph indicator — Not on the record
Temperature indicator — Not on the record