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Tsuga heterophylla - (Pseudotsuga menziesii, Thuja plicata) / Polystichum munitum - Athyrium filix-femina Forest | NatureServe Biotics 2019
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Name: Tsuga heterophylla - (Pseudotsuga menziesii, Thuja plicata) / Polystichum munitum - Athyrium filix-femina Forest Reference: NatureServe Biotics 2019 Description: This western hemlock forest of Washington and Oregon and possibly British Columbia and California has a canopy dominated by a variable mixture of <i>Tsuga heterophylla, Pseudotsuga menziesii</i>, and/or <i>Thuja plicata</i>. <i>Tsuga heterophylla</i> or <i>Thuja plicata</i> always occupy at least 10% total cover and dominate tree regeneration. <i>Acer macrophyllum</i> or <i>Alnus rubra</i> are sometimes prominent. A well-developed tall-shrub layer dominated by <i>Acer circinatum</i> is often present. Shorter shrubs are usually sparse but often include <i>Rubus spectabilis</i> (an important indicator for the type) and <i>Vaccinium parvifolium</i>. The herb layer is dominated by <i>Polystichum munitum</i>, usually growing taller and more densely than it does in other settings. Frequent herbs which are indicative of the association are <i>Athyrium filix-femina, Tiarella trifoliata, Blechnum spicant, Gymnocarpium dryopteris</i>, and <i>Dryopteris expansa</i>, one or more of which is sometimes prominent. Other frequent herbs include <i>Achlys triphylla</i> and <i>Clintonia uniflora</i>. In Washington, this association occurs at low elevations in the western Cascades and the Olympic Peninsula except in the wettest part of the western Olympics and on the outer coastal strip. Sites are usually on lower or toe slopes or riverine terraces. Soils are moist and often deep. This association occurs within a narrow environmental range in the mountains of western Washington and has been impacted by logging.  Accession Code: urn:lsid:vegbank.org:commConcept:34326-{C2B04FB4-51C7-4283-BD5D-477CED2C02A3} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 11-May-2016 to: ongoing
	status: accepted Community's Parent: Tsuga heterophylla - Pseudotsuga menziesii / Rubus spectabilis Mesic Forest Alliance This Community's Level: Association This Community's Children: [none]		Names:   UID: ELEMENT_GLOBAL.2.942472 NatureServe Explorer   Code: CEGL005576   Translated: Western Hemlock - (Douglas-fir, Western Red-cedar) / Western Swordfern - Common Ladyfern Forest   Scientific: Tsuga heterophylla - (Pseudotsuga menziesii, Thuja plicata) / Polystichum munitum - Athyrium filix-femina Forest