protostele

[ proh-tuh-steel, -stee-lee ]

Phonetic (Standard)IPA

noun

, Botany.

the solid stele of most roots, having a central core of xylem enclosed by phloem.

protostele

/ ˈprəʊtəˌstiːl; -ˌstiːlɪ /

a simple type of stele with a central core of xylem surrounded by a cylinder of phloem: occurs in most roots and the stems of ferns, etc

protostele

/ prō′tə-stēl′,prō′tə-stē′lē /

The most primitive form of stele, consisting of a solid core of xylem encased by phloem or of xylem interspersed with phloem. The roots of all vascular plants, as well as the stems of lycophytes, have protosteles.

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First recorded in 1900–05; proto- + stele

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In its simplest form (as in fig. 36) it is called a protostele, and is to be found in both living and fossil plants.

In the Coal Measure period, however, the protostele was characteristic of one of the two main groups of ferns.

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