Thinleaf alder (Alnus tenuifolia)

[ Trees > Hardwoods > Alders . . . ]      Forest Type: Western Mountain Streams


Small tree growing along western mountain streams; leaves coarsely toothed, 2-4 inches long, stretched-oval, with 6-9 pairs of veins.

by Michael Kuo

Habitat: Found in western North America along mountain streams, or around mountain lakes and bogs.

Stature: Up to 30 feet high; trunk to 8 inches in diameter; when mature featuring a narrow, rounded crown.

Leaves: 2-4 inches long; simple; sometimes very slightly lobed; coarsely and doubly toothed; dark green above; paler below; with 6-9 pairs of veins.

Bark: Thin; smooth when young, becoming a little scaly; gray to reddish brown.

Fruit: A tiny, nearly circular nut; cones up to about 1/2 inch long.

(References consulted)

Frequent Mushroom Associates

Many mycorrhizal species, especially in the genera Lactarius (including Lactarius glyciosmus) and Russula; also saprobes in Mycena (including Mycena haematopus var. cuspidata, Mycena roseipallens, and Mycena alnicola); and Psathyrella.


Alnus tenuifolia

Alnus tenuifolia

Alnus tenuifolia

Alnus tenuifolia

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Kuo, M. (2010, November). Thinleaf alder (Alnus tenuifolia). Retrieved from the MushroomExpert.Com Web site: