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Thuja plicata - Pseudotsuga menziesii - Abies grandis / Mahonia nervosa / Polystichum munitum Forest |
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Name: Thuja plicata - Pseudotsuga menziesii - Abies grandis / Mahonia nervosa / Polystichum munitum Forest
Reference:
Description: This small-patch forest community occurs on gentle and middle slopes on all aspects within the Georgia Basin of British Columbia and adjacent Washington. These sites occur at elevations from 0 to 190 m. This plant community is characterized by a closed canopy of mixed conifers and a moderate shrub layer dominated by <i>Mahonia nervosa</i> and/or <i>Gaultheria shallon</i>, herb layer dominated by <i>Polystichum munitum</i>, and moss layer dominated by feathermosses. <i>Thuja plicata, Pseudotsuga menziesii</i>, and <i>Abies grandis</i> are usually present with high cover and typically codominate the overstory. The moderately well-developed shrub layer consists primarily of moderate cover of <i>Mahonia nervosa</i> and <i>Gaultheria shallon</i> together with low cover of <i>Rosa gymnocarpa</i> and <i>Vaccinium parvifolium</i>. <i>Polystichum munitum</i>, and often <i>Achlys triphylla</i> in British Columbia, dominate the moderately well-developed herb layer often with low cover of <i>Trientalis borealis, Rubus ursinus, Galium triflorum, Festuca subulata</i>, and <i>Trillium ovatum</i>. The moderately well-developed moss layer is dominated by high cover of <i>Eurhynchium oreganum</i> usually with low cover of <i>Leucolepis acanthoneuron</i> and <i>Hylocomium splendens</i>. It is distinguished from the similar but more species-poor ~<i>Pseudotsuga menziesii - (Abies grandis, Thuja plicata) / Mahonia nervosa - Gaultheria shallon</i> Forest (CEGL002845)$$ by high cover of rich-site indicator <i>Polystichum munitum</i> and other species such as <i>Tiarella trifoliata, Trillium ovatum</i>, and the moss <i>Leucolepis acanthoneuron</i>. It is distinguished from the similar <i>Pseudotsuga menziesii - Tsuga heterophylla / Gaultheria shallon / Polystichum munitum</i> Forest (Chappell 2005), which occurs more commonly in more moist climates, by the relative paucity of <i>Tsuga heterophylla</i> in relation to <i>Thuja plicata</i> and <i>Abies grandis</i>. 
Accession Code: VB.CC.37344.CEGL002848
Plot-observations of this Community Concept: 0
      Party Perspective according to: NatureServe (organization)
Perspective from: 17-Nov-2014 to: 01-May-2019
     
  • status: accepted
  • This Community's Level: association
  • This Community's Children: [none]
Names:   Translated: Western Red-cedar - Douglas-fir - Grand Fir / Cascade Barberry / Western Swordfern Forest
  Scientific: Thuja plicata - Pseudotsuga menziesii - Abies grandis / Mahonia nervosa / Polystichum munitum Forest
  Code: CEGL002848
  UID: ELEMENT_GLOBAL.2.787997 NatureServe ExplorerNatureServe Explorer logo