Sentence Examples


  • (X 135.) px, Protoxylem of strand.
  • The single stele in the stem consisted of the phloem surrounding a solid central strand of xylem, the groups of protoxylem being situated at the projecting angles.
  • In Sphenophyllum, in which the transverse section of the xylem is triangular, there were three or six protoxylem groups; in Cheirostrobus they were more numerous.
  • The stem is monostelic, the protoxylem groups being towards the periphery of the xylem, the development of which is thus centripetal; the centre of the stele is occupied by sclerenchymatous tissue.
  • Spinosa) the radial stele has a number of protoxylem groups arranged round the periphery, much as in Lepidodendron.
 

How would you define protoxylem? Add your definition here.

comments powered by Disqus