This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...in which it was formed, and soon elongates and thickens until its lower end pushs down into the end of Fig.218 An antheridium (a) of a moss. From its tip the sperms (b) are escaping, and one of them is shown enlarged at the side (c). a and b, magnified 350 times; c, magnified 800 times. After Sachs the ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...in which it was formed, and soon elongates and thickens until its lower end pushs down into the end of Fig.218 An antheridium (a) of a moss. From its tip the sperms (b) are escaping, and one of them is shown enlarged at the side (c). a and b, magnified 350 times; c, magnified 800 times. After Sachs the stem upon which the archegonium grew. This gives the lower end a foothold in the stem, and by reason of its close contact this end, or foot as it is called, absorbs food material from the stem. The young stalk also bears chlorophyll and may manufacture some of its own food. The upward end elongates rapidly and carries up with it the old archegonium wall, which meantime has grown somewhat (Figs. 216 and 219). This elongated structure is called the seta, which means a "bristle" or "hair." Since this old archegonium now changed is like a hood, it is called calyptra, which means "hood." Beneath the calyptra, at the end of the seta, there is formed the enlarged capsule. Within the capsule, by division of certain specialized cells, large numbers of spores are formed. At the extreme tip of the capsule, beneath the calyptra, is the mouth, or peristome, which is covered by a lid known as the operculum, meaning the "cover" or "lid." When the spores are ripe the calyptra may fall off and the operculum be thrown off by swelling of the cells immediately below it. There then appears around the margin of the mouth a row of teeth (Fig. 220). The number of teeth in a capsule is definite for each species of moss, and sometimes special students of Fig. 219. Growth of the moss oospore to form the sporophyte At A is a diagram of the oospore after it has gone through several cell divisions and has spread the...
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