Spirogyra differs from moss protonema in having

Pyrenoid

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Branched filament

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Discoid chloroplast

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Rhizoidal branches

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Solution

The correct option is A Pyrenoid
Protonema are the algae-like filamentous structures that represents the juvenile gametophyte of most mosses and liverworts except Hornworts. This is a thread like chain of cells that forms the haploid phase of the bryophyte life cycle. While the Spirogyra filament is very similar to protonema, it is consists of a cell wall and protoplast. The protoplast consist of ribbon shaped chloroplast with row of pyrenoids.
Therefore, the correct answer is option A.

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