Title: Elementary botany
Identifier: elementarybotany00atki (find matches)
Year: 1898 (1890s)
Authors: Atkinson, George Francis, 1854-1918
Subjects: Botany
Publisher: New York, H. Holt and company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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166 MORPHOLOGY. middle portion toward the end. This is because of the shorter pinnae here. 347. Fruit "dots" (sorus, indusium).—If we examine the under side of such short pinnae of the Christmas fern we see that there are two rows of small circular dots, one row on either side of , the pinna. These are called the " fruit ts," or sori (a single one is a sorus). If examine it with a low power of the mi- croscope, or with a pocket lens, we willseethat there is a circular disk which c o vers more or less com- pletely very inute objects, nsual- the ends of the •rojecting just be- le edge if they are This circular disk is called the indu- nd it is a special th of the epidermis leaf here for the 3U of the spore - These minute ob- jects underneath are the fruit bodies, which in the case of the ferns and their allies are called sporangia. This indusium in the case of the Christmas fern, and also in some others, is attached to the leaf by means of a short slender stalk
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Fig. 203. Christmas fern (Adiantum acrostichoides).

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