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Frond composed of aggregated, articulated, longitudinal cells, whorled at intervals with short, horizontal, cylindrical or beaded, jointed ramuli. Fructification: ovate spores and tufts of antheridial cells attached to the lateral ramuli, which consist of minute, radiating, dichotomous beaded filaments. Aquatic. Chaetophoraceae.
Conceive a dichotomous tree one that always divides into two branches to pass through a plane. We should have, as a plane section, a circle of changing size, which would elongate and divide into two circles, each of which would do the same.
They grew to a great height, from 30 to 60, or even 70 feet, with regular cylindrical stems, and without branches, although some species were dichotomous towards the top.
All the stools of the fossil trees dug out by us divided into four parts, and these again bifurcated, forming eight roots, which were also dichotomous when traceable far enough. The cylindrical rootlets formerly regarded as leaves are now shown by more perfect specimens to have been attached to the root by fitting into deep cylindrical pits.
A logical method upon which he constantly insisted is that of 'bipartition, called also the 'dichotomous' or 'bifurcate' method, and exemplified by the so-called 'Porphyrian Tree. The principle is, of course, simple. Take any genus: divide it into two classes, one of which has and the other has not a certain mark. The two classes must be mutually exclusive and together exhaustive.
It is an interesting fact that the world, or especially an improved new edition of the world, comes from the body of a dying being. Some one kills this being and so causes an improved creation. So, beside the superior knowledge, a superior efficiency. Dismemberments in creation myths are not always multiple but sometimes dichotomous.
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