On the Expansion of Bast Cells in Conifers

抄録

1) Modification of bast cells in the outer bark (rhytidome) of coniferous plants is an isodiametric enlargement and radial elongation of parenchyma cells, sieve tubes, and phloem ray cells in the Pinaceae, and an extraordinary expansion of bast parenchyma cells or sieve tubes in the Taxodiaceae and Cupressaceae.
2) Extraordinary expansion of bast cells in the outer bark, although common in Sciadopitys verticillata and Cunninghamia lanceolata, is less so in Cryptomeria japonica, Thuja Standishii, and Chamaecyparis pisifera.