Differentiate between Eustele and Atactostele

Eustele and atactostele are types of siphonostele arrangement in plants. A stele is the arrangement of vascular bundles. In siphonosteles the conducting tissues are arranged in a hollow cylinder with a central parenchymatous pith. Let us look at their differences:




It is a type of siphonostele in which the vascular bundles are arranged in a ring.

It is a variation of eustele where the vascular bundles are scattered.


Found in stems of dicots and roots of monocots.

Characteristics of monocot stems.

Presence of Pith

Pith is present.

Pith is absent.


The layer of tissues between the vasculature and outer epidermis is the cortex.

The region between the vascular bundles is the ground meristem.

The xylem is located towards the inside, and the phloem is located towards the outside.

The xylem and phloem are scattered throughout the ground tissue.


Sunflower, Buttercup, etc


Explore BYJU’S Biology for more.

Also see:


What is the meaning of Atactostele?

Atactostele is a variation of eustele, occurring in monocots where the vascular bundles are present in a scattered manner.

What is eustele and its examples?

Eustele is a type of siphonostele arrangement where the vascular bundles are arranged in a ring. Example: Sunflower and Buttercup.

What is an Amphivasal vascular bundle?

It is a type of vascular bundle where the phloem is surrounded by the xylem.

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