. Practical botany. Botany. 286 PRACTICAL BOTANY. Fig. 238. The bulblet fern {Gystopteris buMfera) A, a leaf upon which vegetative reproductive growths or bulbs (6) are formed ; B, a section of the leaf on the underside of which groups of sporangia (indusia) are borne; C, one indusium in detail spores are produced, a com- paratively small part of the sporophyte is given to spore formation, most of it doing nutritive work. The fern sporophyte may grow from year to year (is perennial), producing new leaves, a new supply of food, and new crops of spores each year. The complexity and prom- inence
. Practical botany. Botany. 286 PRACTICAL BOTANY. Fig. 238. The bulblet fern {Gystopteris buMfera) A, a leaf upon which vegetative reproductive growths or bulbs (6) are formed ; B, a section of the leaf on the underside of which groups of sporangia (indusia) are borne; C, one indusium in detail spores are produced, a com- paratively small part of the sporophyte is given to spore formation, most of it doing nutritive work. The fern sporophyte may grow from year to year (is perennial), producing new leaves, a new supply of food, and new crops of spores each year. The complexity and prom- inence of the fern sporo- phyte and the comparative simplicity and inconspicu- ousness of the gametophyte are forerunners of the greater increase in sporophyte and decrease in gametophyte that is to be found later in higher plants. 265. Types of ferns. Ferns are usually distinguished from one another by the leaves, the sori, and the sporangia. There is considerable varia- tion in position and arrangement of sori in different ferns (Figs. 232,238,239). In some the sori are regularly placed dots upon the leaf. In others, as the maiden- hair ievn(^Adiantu'm). 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Caldwell, Otis William, 1869- joint author. Boston, New York [etc. ] Ginn and company
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