. Botany all the year round; a practical text-book for schools. Botany. THEIR PLACE IN NATURE 251. 473. — A seaweed with broad expanded thallus. 356. Classification. — Beginning with the lowest forms, seedless plants are grouped into three great orders, or classes. 357. I. Thallophytes, or thallus plants. This group takes its name from the thallus structure that characterizes its vegetation. What a thallus is will be better understood after a specimen has been examined. It may be stated, how- ever, that the term is applied in general to the simplest kinds of vegetable struc- ture, in which the
. Botany all the year round; a practical text-book for schools. Botany. THEIR PLACE IN NATURE 251. 473. — A seaweed with broad expanded thallus. 356. Classification. — Beginning with the lowest forms, seedless plants are grouped into three great orders, or classes. 357. I. Thallophytes, or thallus plants. This group takes its name from the thallus structure that characterizes its vegetation. What a thallus is will be better understood after a specimen has been examined. It may be stated, how- ever, that the term is applied in general to the simplest kinds of vegetable struc- ture, in which there is no differentiation of tissues, and no true distinction of root, stem, and leaves. While it is not peculiar to the thallophytes, it has attained its most typical development among them, and the name is therefore retained as distinctive of that group. It embraces two great divisions, the Algae and Fungi. The first includes seaweeds and the common fresh-water- brook silks, pond scums, etc., besides numerous micro- scopic forms whose presence escapes the eye altogether, or is made known only by the discolorations and other changes they effect in the water. To the fungi belong the mushrooms and puff balls, the molds, rusts, mildews, etc., and the vast tribe of microscopic organisms called bac- teria, that are so active in the pro- duction of fermentation, putrefaction, and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Andrews, Eliza Frances, b. 1840. New York, Cincinnati [etc. ] American book company
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