a flowerless plant growing and producing its reproductive structures at the apex only, as ferns and mosses.
Historical Examples

acrogen, ak′ro-jen, n. a plant that grows at the top chiefly, as a tree-fern.
Chambers’s Twentieth Century Dictionary (part 1 of 4: A-D) Various

any flowerless plant, such as a fern or moss, in which growth occurs from the tip of the main stem


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