Young Prothallus of Fern
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An illustration of a young prothallus: sp, spore; pr, prothallus. A prothallium, or prothallus is usually a pteridophyte, i.e. spore-bearing plant, (almost exclusively ferns) in gametophyte stage in the alternation of generations cycle.
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FernsSource
Benson John Lossing, ed. The New Popular Educator (London, England: Cassell & Company Limited, 1891)
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