Douglas-Fir (Pseudotsuga menziesii)

[ Trees > Conifers . . . ]      Forest Type: Douglas-Fir


Cones 2-4.5 inches long, with long spines; branches randomly attached; needles about an inch long, fairly flat; western in distribution.

by Michael Kuo

Habitat: On the west coast and in the Rocky Mountains; preferring northern exposure; in pure stands or mixed with other conifers.

Stature: To 300 feet tall on the west coast, 130 feet in the Rockies; tightly pyramid-shaped; branches randomly attached; trunk typically straight.

Needles: To about 1 inch long; more or less flattened; spirally arranged.

Bark: 6-24 inches thick at maturity; smooth at first, later with reddish brown ridges separated by furrows.

Cones: To about 4 inches; with spiny projections; scales rounded; maturing in one season.

(References consulted)

Frequent Mushroom Associates:

According to David Arora (1986) "[t]here are well over 1,000 kinds of mushrooms known to form mycorrhiza with Douglas fir, and the great Douglas fir forests of the Pacific Northwest are among the best fungal foraging grounds in the world" (35). Additionally, many saprobic mushrooms are devoted to decomposing the debris of Douglas-fir. Species include Agaricus buckmacadooi; Amanita aprica; Amanita lanei; Amanita smithiana; Auriscalpium vulgare; Calocybe onychina; Cantharellus subalbidus; Floccularia fusca; Gomphidius subroseus; Helvella maculata; Hydnum oregonense; Hypholoma capnoides; species of Lactarius; Leccinum caespitosum; Mycena subsanguinolenta, Mycena insignis, Mycena subvitrea, and Mycena pusilla; Phaeolus schweinitzii; Rhodofomes cajanderi; species of Russula (including Russula xerampelina); Sparassis radicata; Suillus lakei; Suillus caerulescens; and many others.


Pseudotsuga menziesii

Pseudotsuga menziesii

Pseudotsuga menziesii

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Cite this page as:

Kuo, M. (2003, August). Douglas-fir (Pseudotsuga menziesii). Retrieved from the MushroomExpert.Com Web site: