Pinus Sylvestris
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“Radial longitudinal section of wood of Pinus Sylvestris. a, cambium; b, c, d, e, f, wood cells; f, bordered pits in an early stage of formation, before the thickening ring has arched over the thin portion of cell’wall; t’, bordered pit after the thickening mass has arched over the thin cell-wall; st, very large pits where in contact with medullary rays.” — Encyclopedia Britanica, 1893
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Cellular BotanySource
The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)
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