Caracter铆sticas Microsc贸picas
CONIFERAS Parte 2
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21.- Warty layer. Actinostrobus piramidalis, tangential section. 22.- Warty layer. Actinostrobus piramidalis, radial section.
Escala 21-22 = 50Âľm
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23.- Helical thickenings single and widely spaced. Taxus baccata, radial section. 24.-Helical thickenings single and narrowly spaced. Pseudotsuga menziesii. 25.- Helical thickenings grouped in pairs and widely spaced. Torreya californica, tangential section.
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Escala 23-25 = 100Âľm.; 26 = 50Âľm.
26.- Helical thickenings in ray tracheids. Pseudotsuga japonica, radial section.
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27.- Tracheids also with a warty layer. Callitris preisii, radial section. 28.- Tracheids also with a warty layer. Callitris columellaris, tangential section.
Escala 27 = 20Âľm ; 28 = 50 Âľm
29 – 32.- Axial parenchyma present, cross section.
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29.-Arrangement diffuse. Taxodium distichum. 30.- Arrangement tangentially zonate. Cryptomeria japonica. 31.- Arrangement tangentially zonate in latewood at the growth ring boundary, see arrows. Sequoia sempervirens.
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Escala 29-32= 1mm.
32.- Arrangement diffuse and tangentially zonate. Taxodium distichum.
33 – 36.- Transverse end walls of axial parenchyma cells, tangential sections. 76
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33.- End walls smooth. Podocarpus elongatus. 34.- End walls irregularly thickened. Cryptomeria japonica. 35 y 36.- End walls beaded or nodular. Taxodium distichum.
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Escala 33,35 = 100µm.; 34,36 = 50µm.
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37 y 38.- Ray composition, radial sections. 37.- Ray with three rows of ray tracheids along upper part of ray. Picea abies. 38.- Ray tracheids absent. Taxodium distichum. Escala 37-38 = 50Âľm