Pamphlets on Forestry, Volume 41991 |
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Page 458
... RESIN CANALS Aside from true tyloses , there is often observed in certain species of conifers a partial or complete closing of the resin canals , produced by parenchyma cells , but not by growth of the membrane of the one - sided 1 ...
... RESIN CANALS Aside from true tyloses , there is often observed in certain species of conifers a partial or complete closing of the resin canals , produced by parenchyma cells , but not by growth of the membrane of the one - sided 1 ...
Page 459
... Resin canals or ducts are normally present in the following coniferous genera : Larch , or tamarack ( Larix ) , spruce ( Picea ) , Douglas fir ( Pseu- dotsuga ) , and pine ( Pinus ) . These canals when seen in cross section often bear a ...
... Resin canals or ducts are normally present in the following coniferous genera : Larch , or tamarack ( Larix ) , spruce ( Picea ) , Douglas fir ( Pseu- dotsuga ) , and pine ( Pinus ) . These canals when seen in cross section often bear a ...
Page 467
... resin canals and their condition — that is , whether they are open or partly or entirely closed by cells - considered in conjunction with the general permeability of the tracheids , is a factor of practical significance in the selection ...
... resin canals and their condition — that is , whether they are open or partly or entirely closed by cells - considered in conjunction with the general permeability of the tracheids , is a factor of practical significance in the selection ...
Contents
The Huron River valley 351 | 351 |
their development and ecological conditions | 360 |
The bog plant societies | 429 |
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2d whorl 4th whorl abundant acidity aggregate ray Alnus aments annual ring apex Aronia basin bast fibers Betula bog areas bog plants bog societies bog water branches cambial activity cambium cassandra conifers creosote crystals cutting depressions diameter increase Dicotyledons drainage drained factors Fagales fiber bundles foliar ray forest formation glacial growth habitats HARTIG heartwood hickory Huron June lake larch Larix layers leaves lower Michigan moraine occur parenchyma parenchyma cells peat perianth periderm phloem pine Pinus piñon Pinus rigida pith rays plant societies Platanus plates present Quercus radial region resin canals roots rows Salix sapwood scattered sclerenchyma sclerotic sedge shrubs sieve tubes soil species specimens sphagnum stem stone cells substratum surface swamp tamarack temperature thick tissue tracheids trees trunk tyloses undrained uniseriate rays vegetation vessels Viola blanda walls white oak wood xerophilous xylem zone μ μ μ