Protophloem Sentence Examples
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In many cases externai protophloem, usually consisting of narrow sieve-tubes often with swollen walls, can be distinguished from metaphloem.
The protoxylem and protophloem are developed a few cells from the inner and outer margins respectively of the desmogen strand, the desmogenic tissue left over giving rise to the segments of endocycle and pericycle capping the bundle.
Xylem and protophloem alone are differentiated) being very much shorter than in the stem.