When a group of algal cells are imprisoned in fungal mycelium and whole of this group is then used for vegetative multiplication of a lichen, it is called as

Isidium

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Soredium

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Cephalodium

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Helotism

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Solution

The correct option is B Soredium
Soredium is small body, consisting of a core of algal cells surrounded by fungal hyphae, that functions as a structure of vegetative propagation in lichens. Soredia are powdery propagules composed of fungal hyphae wrapped around cyanobacteria or green algae. Fungal hyphae make up the basic body structure of lichen. The soredia are released through openings in the upper cortex of the lichen structure.
Thus, the correct answer is option B.

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