Give a brief account of prothallus.

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Detailed Solution

* In pteridophytes haploid spores germinate and form multicellular, free living thalloid structure called prothallus.
* It is mostly photosynthetic.
* It grows in cool, damp and shady locations.
* It bears sex organs antheridia and archegonia.
* In homosporous pteridophytes both antheridia and archegonia develop on the same prothallus.
* In heterosporous pteridophytes antheridia and archegonia develop on separate prothallus.

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