acrogens

-- What a strange union of roots, that of monocotyledons in the main divisions, and of pure acrogens in the minor!!

Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries William Griffith

I know nothing of Lycopodineae, more than they are the highest of all acrogens; and are not to be included in the same category with ferns.

Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries William Griffith

No such thing as a petiolate leaf occurs in acrogens, all are attached by

Journals of Travels in Assam, Burma, Bhootan, Afghanistan and the Neighbouring Countries William Griffith

Next succeed the acrogens, or flowerless plants that possess both stems and leaves — such as the ferns and their allies.

Essays and Reviews: The Education of the World, Bunsen's Biblical Researches, On the Study of the Evidences of Christianity; Seances Historiques de Gen��ve; On the Mosaic Cosmogony; Tendencies of Religious Thought in England, 1688-1750; On the Interpretation of Scripture. 1821-1902 1860

The order in which fossils of these several classes appear in the strata, Hugh Miller states to be as follows: — In the Lower Silurian we find only thallogens, in the Upper Silurian acrogens are added.

Essays and Reviews: The Education of the World, Bunsen's Biblical Researches, On the Study of the Evidences of Christianity; Seances Historiques de Gen��ve; On the Mosaic Cosmogony; Tendencies of Religious Thought in England, 1688-1750; On the Interpretation of Scripture. 1821-1902 1860

This last result led me to Lindley's "Vegetable Kingdom," in which I found (excluding thallogens and acrogens) that the genera include each

More Letters of Charles Darwin — Volume 1 Charles Darwin 1845