. A text-book of botany for secondary schools. Botany. ICC A TEXT-BOOK OF BOTANY reproduction by producing sexual cells (gametes), which by fusing in pairs (fertilization) form oospores. At first the pairing gametes are alike, but later they become very different, and are called sperms and eggs. The organ pro- ducing sperms is called the antheridium, and that pro- ducing an egg the oogonium; and among the Thallophytes each of these organs consists of a single cell. (4) Algw the independent line.—This means not only that the Fungi have probably been derived from the Algae by losing the ability
. A text-book of botany for secondary schools. Botany. ICC A TEXT-BOOK OF BOTANY reproduction by producing sexual cells (gametes), which by fusing in pairs (fertilization) form oospores. At first the pairing gametes are alike, but later they become very different, and are called sperms and eggs. The organ pro- ducing sperms is called the antheridium, and that pro- ducing an egg the oogonium; and among the Thallophytes each of these organs consists of a single cell. (4) Algw the independent line.—This means not only that the Fungi have probably been derived from the Algae by losing the ability to make their own food, but also that the higher plants have been derived from the Algae. Accord- ingly the liverworts, about to be studied, are believed to have developed from the Algse. 91. General character of Liverworts.—Liverworts are found in a variety of conditions, some floating, many in damp places, and many on the bark of trees. They seem to be plants that have barely learned to live on land, and this change from the water to the land is one of the greatest and most important in the history of plants. Although in general they are moisture-loving, some can endure great. Fig. 160.—Ricciocarpus: showing thallose body, forked branching, rhizoids on the under surface, and spore-cases along the main axes (showing position of archegonia). dryness, so that the land habit can be said to have become well-established among the 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 Coulter, John Merle, 1851-1928. New York, D. Appleton
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1906
