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How is leafy stage formed in mosses? How is it different from protonema?

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The leafy stage in some mosses develops from a lateral bud in the secondary protonema. It is a small leafy structure consisting of rhizoid, leaves and stem. It bears the se* organs antheridia and archegonia. Whereas, Protonema is the gametophytic phase of mosses directly develops from haploid spores
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A protonema is a thread-like chain of cells that forms the earliest stage (the haploid phase) of in the life cycle of mosses and liverworts . When a moss first grows from the spore, it grows as a protonema which develops into a leafy gametophore.
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