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What is secondary protonema?
The protonema formed by other methods, than from the germination of the spore, are known as secondary protonema. Morphologically they are quite alike to primary protonema. The secondary protonema may develop from the exposed rhizoid or any other detached living part of the gametophyte. These protonema also produce buds which develop into gametophytes. Example: Funaria hygrometrica.


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