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Pinus albicaulis is the only type of tree on the summit of Pywiack Dome in Yosemite National Park. Pinus albicaulis, known by the common names whitebark pine, white bark pine, white pine, pitch pine, scrub pine, and creeping pine, [4] is a conifer tree native to the mountains of the western United States and Canada, specifically subalpine areas of the Sierra Nevada, Cascade Range, Pacific ...
For seeds of many species, light is also necessary, and facilitates the germination of seeds in other species, [7] but spruces are not exacting in their light requirements, and will germinate without light. White spruce seed germinated at 35 °F (1.7 °C) and 40 °F (4.4 °C) after continuous stratification for one year or longer and developed ...
Cronartium ribicola is a species of rust fungus in the family Cronartiaceae that causes the disease white pine blister rust. Other names include: Rouille vésiculeuse du pin blanc (French), white pine Blasenrost (German), moho ampolla del pino blanco (Spanish). [2]
It is a measure of germination time course and is usually expressed as a percentage, e.g., an 85% germination rate indicates that about 85 out of 100 seeds will probably germinate under proper conditions over the germination period given. Seed germination rate is determined by the seed genetic composition, morphological features and ...
The seed cones are slender, 8–16 cm (3 + 1 ⁄ 4 – 6 + 1 ⁄ 4 in) long (rarely longer than that) and 4–5 cm (1 + 1 ⁄ 2 –2 in) broad when open, and have scales with a rounded apex and slightly reflexed tip, often resinous.
The seeds are small, 4–7 mm (3 ⁄ 16 – 1 ⁄ 4 in) long, and have a long slender wing 15–22 mm (9 ⁄ 16 – 7 ⁄ 8 in) long. The branches are borne in regular whorls , [ 5 ] produced at the rate of one a year; this is pronounced in narrow, stand-grown trees, while open specimens may have a more rounded form with wide-reaching limbs.
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Open cone with empty pine nuts. The seed cones open to 6–9 cm (2 + 1 ⁄ 4 – 3 + 1 ⁄ 2 in) broad when mature, holding the seeds on the scales after opening. The seeds are 11–16 mm (7 ⁄ 16 – 5 ⁄ 8 in) long, with a thin shell, a white endosperm, and a vestigial 1–2 mm (1 ⁄ 32 – 3 ⁄ 32 in) wing.
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