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What is protostele? Explain its types.

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In protostele xylem surrounds phloem. The type includes Haplostele, Actinostele, Plectostele and mixed protostele.

1. Haplostele: Xylem surrounded by phloem is known as haplostele. 

E.g. Selaginella. 

2. Actinostele: Star shaped xylem core is surrounded by phloem is known as actinostele. 

E.g. Lycopodium serratum.

3. Plectostele: Xylem plates alternates with phloem plates. 

E.g. Lycopodium clavatum.

4. Mixed prototostele: Xylem groups uniformly scattered in the phloem. 

E.g. Lycopodium cernuum.

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