The elements of botany for The elements of botany for beginners and for schools elementsofbotany00gray Year: 1887 170 CRYPTOGAMOUS OR FLOWERLESS PLANTS. [SECTION 17. all the Fresh-water Algae, such as those which constitute the silky threads or green slime of running streams or standing pools, and which were all called Confervas before their immense diversity was known. Some are formed of a single row of cells, developed each from the end of another. Others branch, the top of one cell producing more than one new one (Fig. 564). Others, of a kind which is very common in fresh water, simple thr
The elements of botany for The elements of botany for beginners and for schools elementsofbotany00gray Year: 1887 170 CRYPTOGAMOUS OR FLOWERLESS PLANTS. [SECTION 17. all the Fresh-water Algae, such as those which constitute the silky threads or green slime of running streams or standing pools, and which were all called Confervas before their immense diversity was known. Some are formed of a single row of cells, developed each from the end of another. Others branch, the top of one cell producing more than one new one (Fig. 564). Others, of a kind which is very common in fresh water, simple threads made of a line of cells, have the chlorophyll and protoplasm of each cell ar- ranged in spiral lines or bands. They form spores in a peculiar way, which gives to this family the designation of conjugating Algae. 512. At a certain time two par- allel threads approach each other more closely ; contiguous parts of
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