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The Douglas squirrel harvests and hoards great quantities of Douglas-fir cones, and also consumes mature pollen cones, the inner bark, terminal shoots, and developing young needles. [13] Mature or "old-growth" Douglas-fir forest is the primary habitat of the red tree vole (Arborimus longicaudus) and the spotted owl (Strix occidentalis).
Coast Douglas-fir is the second-tallest conifer in the world (after coast redwood), and the third-tallest of all trees, (after Eucalyptus regnans).Currently, coast Douglas-fir trees 60–75 metres (197–246 ft) or more in height and 1.5–2 metres (4.9–6.6 ft) in diameter are common in old growth stands, [4] and maximum heights of 100–120 metres (330–390 ft) and diameters up to 4.5–5. ...
Pseudotsuga macrocarpa typically grows from 15–30 m (49–98 ft) in height and 56–155 cm (1 ft 10 in – 5 ft 1 in) in trunk diameter. [6] The growth form is straight, with a conical crown from 12–30 m (39–98 ft) broad, and a strong and spreading root system.
Rocky Mountain Douglas-fir is a large tree, typically reaching 35–45 m (115–148 ft) in height and 1 m (3 ft 3 in) in diameter, with exceptional specimens known to 67 m (220 ft) tall, and 2 m (6 ft 7 in) in diameter. It commonly lives more than 500 years and occasionally more than 1,200 years.
Douglas-firs are medium-size to extremely large evergreen trees, 20–120 metres (70–390 ft) tall (although only coast Douglas-firs reach such great height). [6] The leaves are flat, soft, linear, 2–4 centimetres (0.8–1.6 in) long, generally resembling those of the firs, occurring singly rather than in fascicles ; they completely encircle ...
The difficulty of getting water so far up into the sky is what ultimately constrains growth. [45] Other researchers have developed models of maximum height for Coast Douglas-fir ( Pseudotsuga menziesii var. menziesii ) trees that yield similar estimates of 109–138 meters (357–452 feet), [ 46 ] a range that includes the height of the tallest ...
The Doerner Fir was previously measured in 1991 at 329 feet (100.3 m) tall but had lost 2 feet (0.6 m) as of the latest measurement, in 2008. [3] It is approximately the same height as Centurion , a specimen of Eucalyptus regnans located in southern Tasmania , and as the tallest known specimen of Yellow meranti found in Borneo .
Pseudotsuga menziesii var. lindleyana, commonly known as the Mexican Douglas-fir, is a conifer in the genus Pseudotsuga that is endemic to Mexico. [1] DNA sequence [2] and morphological [3] evidence suggests it is most closely related to Rocky Mountain Douglas-fir (P. menziesii var. glauca) and might best be treated as an additional variety within P. menziesii.
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