Specialized parenchyma cells such as albuminous or companion cells facilitate movements of particles into sieve cells, while apoplastic and symplastic loading allow translocation; a movement from sources to sinks via turgor pressure.
The secondary type can have dilated rays which result from localized anticlinal divisions. In some organisms, it can utilize raffinose in the polymer trap mechanism. The plugging of pores with callose also occurs in these objects, distinguished by their possession of fiber caps. Specialized parenchyma cells such as albuminous or companion cells facilitate movements of particles into sieve cells, while apoplastic and symplastic loading allow translocation; a movement from sources to sinks via turgor pressure. For 10 points, name this tissue concerned with the transport of food, contrasted with xylem.
The secondary type can have dilated rays which result from localized anticlinal divisions.
{Phloem}