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- W2000944150 abstract "1. Wood-parenchyma occurs on the outer surface of the summer wood of Picea. It is sporadic in its occurrence, and while usually appearing infrequently, may be strongly developed. 2. Wood-parenchyma may be very sparsely developed in Larix and Pseudotsuga. 3. Septate tracheids occur associated with the wood-parenchyma in these three genera, and show clearly the steps by which wood-parenchyma has been developed from tracheids. 4. Septate tracheids occur in Pinus, and wood-parenchyma very rarely. 5. Spiral thickenings of the tracheids occur in both the spring and summer wood in Picea and Pseudotsuga, and occur in the summer wood of Larix. These thickenings occur also in Pinus. 6. Spiral thickenings of the marginal and interspersed tracheids of the rays occur in Pinus, Picea, and Larix, as well as in Pseudotsuga. 7. The anatomical characters of the wood are so variable and so similar in Picea, Larix, and Pseudotsuga, that it is difficult to distinguish the extant or fossil woods of the genera. 8. Pinus appears to be quite distinct from the other living Pineae. Yet in the nut and foxtail pines, we see a condition resembling the condition in Picea, Larix, and Pseudotsuga. These pines have small rounded pits in the ray cells, have tangential pits like Picea, have thick-walled epithelium in the canals, and spiral thickenings in the ray tracheids. 9. Picea approaches nearer to the condition in Pinus by having more numerous thin-walled epithelial cells and tyloses, and less well-developed wood-parenchyma; yet Larix and Pseudotsuga also have thin-walled epithelial cells occasionally, and may have the wood-parenchyma poorly developed." @default.
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- W2000944150 date "1909-07-01" @default.
- W2000944150 modified "2023-09-26" @default.
- W2000944150 title "The Structure of the Wood in the Pineae" @default.
- W2000944150 doi "https://doi.org/10.1086/329935" @default.
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