Prothallus
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A prothallus, or prothallium, is usually the gametophyte stage in the life of a fern or other pteridophyte. Occasionally, the term is also used to describe the young gametophyte of a liverwort or peat
Prothallus (prothallium) of the fern Polypodium vulgare seen under a light microscope.
Prothallus of the tree fern Dicksonia antarctica (note new moss plants for scale)
Fern
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Ferns are a group of vascular plants that reproduce via spores and have neither seeds nor flowers. They differ from non-vascular plants by having specialized transport bundles that conduct water and n
The ferns of Great Britain, and their allies the club mosses, pepperworts, and horsetails
Equisetopsida
Flickr brewbooks Angiopteris evecta Mule's foot fern
WP2 Hymenophyllum Exkursion nach Berdorf 011