acrogen
noun
ac·ro·gen
\ˈa-krə-jən\
Definition of acrogen
-s
: a plant of the higher cryptogams predominant in the Carboniferous era including ferns, fern allies, mosses, and liverworts and distinguished by growth from a special cell or growing point — compare thallogen, thallophyte
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Origin and Etymology of acrogen
acr- + -gen; from the growing point's being at the tip of the stem
First Known Use: 1834
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