sieve tube

American  

noun

Botany.

1. a vertical series of sieve cells in the phloem, specialized for the conduction of food materials.

2. a single sieve cell.

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sieve tube British  

noun

1. botany an element of phloem tissue consisting of a longitudinal row of thin-walled elongated cells with perforations in their connecting walls through which food materials pass

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Etymology

Origin of sieve tube

First recorded in 1870–75

Example Sentences

Annular vessel; 2. spiral vessel; 3. pitted vessel; 4. phloëm or sieve tubes; 5. sclerenchyma.

From Project Gutenberg

J, sieve tube from the underground stem, × 300.

From Project Gutenberg

This is the phloëm and it consists of sieve tubes and thin-walled cells.

From Project Gutenberg

Annular vessel; 2. spiral vessel; 3. pitted vessel; 4. sieve tubes or phloëm; 5. sclerenchyma.

From Project Gutenberg

The rest of the bundle is made up of nearly uniform, rather thin-walled, colorless cells, some of which, however, are larger, and have perforated cross-walls, representing the sieve tubes of  the fern bundle.

From Project Gutenberg