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Hedera helix L.
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Ivy
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Araliaceae
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Transversal section |
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Semi-ring- to diffuse-porous. Pores in clusters, predominantly tangentially orientated. Tyloses occasionally present. Growth ring boundaries often festoon-like. Many wide rays, along growth ring boundaries protrude. Ground tissue cells in more or less tangential patches. Apotracheal and paratracheal parenchyma sparse. |
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Radial section |
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Simple perforation plates. Homogeneous to heterogeneous rays, often with up to three rows of square or upright marginal cells. Ray cells thick-walled. Large ray-vessel pits. Libriform fibres occasionally septate, vasicentric tracheids frequent. |
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Tangential section |
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Rays generally 4- to 8-seriate, often narrower or wider. Wide rays with large intercellular spaces frequent. Ray height often higher than 5 mm. |
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Key characters |
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Diffuse- to semi-ring-porous. Pores in tangential groups. Simple perforation plates. Wide rays. Septate fibres. |
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