Characteristics of the phloem

Outside the peripheral circle of vascular bundles is a parenchymatic zone which is bordered by the phellem.

Fig. 3. Vascular bundles. The initial point of the bundles contain lignified fibers, which are interrupted by a zone of unlignified cells. Vessels with paratracheal parenchyma are surrounded by thin- to thick-walled fibers. 1-2 m-high hemicryptophyte, hill zone, Switzerland. Phytolacca americana, transverse section.

Left Fig. 1. Circular arrangement of vascular bundles. The bundels are tangentially interrupted by a large zone of thin-walled, unlignified parenchyma cells. 1-2 m-high hemicryptophyte, hill zone, Switzerland. Phytolacca americana, transverse section.

Right Fig. 2. Circular arrangement of vascular bundles. The bundels are tangentially interrupted by a large zone of thin-walled, unlignified parenchyma cells. 1-2 m-high hemicryptophyte, hill zone, Switzerland. Phytolacca americana, transverse section, x polarized light.

raphides in idioblasts

Fig. 3. Vascular bundles. The initial point of the bundles contain lignified fibers, which are interrupted by a zone of unlignified cells. Vessels with paratracheal parenchyma are surrounded by thin- to thick-walled fibers. 1-2 m-high hemicryptophyte, hill zone, Switzerland. Phytolacca americana, transverse section.

Fig. 4. Very large confluent rays with irregular cells. 1-2 m-high hemicryptophyte, hill zone, Switzerland. Phytolacca americana, tangential section.

Fig. 5. Rhaphides in idioblasts are concentrated in the tangential parenchyma bands. 1-2 m-high hemicryptophyte, hill zone, Switzerland. Phytolacca americana, transverse section, polarized light.

Was this article helpful?

0 0
Building Your Own Greenhouse

Building Your Own Greenhouse

You Might Just End Up Spending More Time In Planning Your Greenhouse Than Your Home Don’t Blame Us If Your Wife Gets Mad. Don't Be A Conventional Greenhouse Dreamer! Come Out Of The Mould, Build Your Own And Let Your Greenhouse Give A Better Yield Than Any Other In Town! Discover How You Can Start Your Own Greenhouse With Healthier Plants… Anytime Of The Year!

Get My Free Ebook


Post a comment