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Which are the different types of tracheids based on the types of thickenings on their walls?

Monjur Alahi

Which are the different types of tracheids based on the types of thickenings on their walls?


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Salim Ahmed Kawsar

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The different types of thickening patterns are seen on their walls such as annular (in the form of rings), spiral (in the form of spring/helix), scalariform (ladder like) and pitted (small circular area). Pitted is the most advanced type of thickening which may be simple or bordered.

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