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Cotoneaster tomentosa Lindley
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Pomaceous Fruit: Cotoneaster
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Rosaceae
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Transversal section |
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Diffuse- to slightly semi-ring-porous. Numerous pores, mostly solitary, relatively small, more or less regularly distributed. Growth ring boundaries distinct to indistinct, dependent on distribution of pores, which varies with growth conditions. Ground tissue fibres relatively thick-walled. Diffuse apotracheal parenchyma, rarely in short, uniseriate tangential bands. Sometimes gum deposits in heartwood vessels. |
    
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Radial section |
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Simple perforation plates. Fine spiral thickenings occur occasionally in the vessels, often only in vessel element tails. Rays almost heterogeneous, often with one or more rows of square to upright marginal cells. Both prismatic crystals and druses sometimes present in rays or in axial parenchyma (idioblasts). Fibre-tracheids present, libriform fibres absent. |
 
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Tangential section |
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Rays generally uni- to biseriate, seldom 3- to 4-seriate. Ray cells round to oval elongated. Average ray height: 5 to 20 cells. |
 
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Key characters |
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Diffuse- to semi-ring-porous. Rays generally uni- to biseriate, almost heterogeneous. Simple perforation plates. Vessel pits opposite, in horizontal rows. |
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Remarks |
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The two species of Cotoneaster cannot be differentiated by wood anatomy. In comparison with other Pomoideae species, they differ only by the presence of heterogeneous, uni- and biseriate rays. |
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