from The Century Dictionary.
- Increasing by growth at the summit or by terminal buds only, as the ferns and mosses; of the nature of or pertaining to acrogens.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Bot.) Increasing by growth from the extremity.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective botany Increasing by growth from the extremity.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adjective pertaining to flowerless plants (ferns or mosses) in which growth occurs only at the tip of the main stem
Sorry, no etymologies found.
Of acrogenous leaves, those only are leaves whose attachment is at right angles with the stem; the rest are divisions of a frond.
Tissue resembling that of their contemporary conifers imparted the necessary rigidity to their framework; nay, so strangely were they pervaded throughout by the coniferous characteristics, that it seems difficult to determine whether they really most resembled the acrogenous or gymnogenous families.
Thus the numbers 5 and 4 and their multiples prevail among dicotyledonous and exogenous plants; the number 3 and its multiples occur among monocotyledonous or endogenous plants; while 2 and 4, and multiples of them, are met with among acotyledonous or acrogenous plants.”