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Ectophloic siphonostele is found in

(a) Osmunda and Equisetum

(b) Marsilea and Botrychium

(c) Adiantum and Cucurbitaceae

(d) Dicksonia and Maidenhair fern.

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The correct option is: (a) Osmunda and Equisetum

Explanation:

Stele is a column containing vascular tissues which is surrounded by pericycle and separated from ground tissue by endodermis. 

Siphonostele is medullated protostele or protostele with a central non-vascular pith. Leaf gaps are absent. Siphonostele is of two types : 

In Ectophloic siphonostele, central pith is surrounded successively by xylem, phloem, pericycle and endodermis. In amphiphloic siphonostele there is a central pith and xylem is surrounded on either side by phloem, pericycle and endodermis. It is found in Osmunda and Equisetum.

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