SFR 107 Lecture Notes - Lecture 7: Thuja, Tsuga Canadensis, Pulvinus

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Foliage: 2 needles per fascicle, dark green, stiff, 9 to 15 cm, do not break cleanly. Cones: ovoid, 5-7 cm, nearly sessile, scales shiny, keeled, short prickle. Foliage: 2 needles per fascicle, blue-green, 4-7 cm, flattened, stiff, often twisted. Cones: ovoid, 3-6 cm, short stalked, scales thin, often with minute prickle. Bark: gray, peeling outer bark reveals orange inner bark. Needle: 12-15 mm, stiff, often slightly curved, sharp pointed, all sides of twig, on short pegs (remain after foliage excised) Cones: 3-4 cm, pendate, scales stiff, may have fine serrations. Ecology: shade-tolerant, late successional, mesic forests, long-lived. Needles: 6-10 mm, stiff, short pegs, sharp pointed, all sides of twig, ashy blue-green. Cones: round to ovate, 1-3 cm, new cones erect, pendate on short stalk, scales stiff, brittle, remain attached. Bark: scaly, dark gray to black. Ecology: wetlands, alpine and coastal sites in acadian region, uplands in boreal forest, shade-intolerant, frequently hybridizes with red spruce, serotinous cones in boreal regioins.

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