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| ovules which are unenclosed, forming on cones or stalks |
| composed of several cells |
| protostele (prō'tə-stēl', prō'tə-stē'lē) Pronunciation Key
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. |