. Plant studies; an elementary botany. Botany. I'TKUlDiii'IlYTES 331 In the ordinary Ferns all the spores in the sporangia are alike, and \ylien they germinate eaeh spore iiroducos a prothalliuni upon which both antheridia and arehegonia appear. In some Pteridophytes, however, there is a decided dif- ference in the size of the spores, some being quite small and. Fig. 301. A scries showing the dehiscence of a fern siiorancrium. the niptnre of the wall, the straightening and bending back of the annnliis. and the recoil.—.\fler Atkinson. others relatiyely large, the small ones producing male game
. Plant studies; an elementary botany. Botany. I'TKUlDiii'IlYTES 331 In the ordinary Ferns all the spores in the sporangia are alike, and \ylien they germinate eaeh spore iiroducos a prothalliuni upon which both antheridia and arehegonia appear. In some Pteridophytes, however, there is a decided dif- ference in the size of the spores, some being quite small and. Fig. 301. A scries showing the dehiscence of a fern siiorancrium. the niptnre of the wall, the straightening and bending back of the annnliis. and the recoil.—.\fler Atkinson. others relatiyely large, the small ones producing male game- tophytes (prothallia with antheridia), and the large ones female gametophytes (prothallia with arehegonia), When asexual spores differ thus permanently in size, and give rise. 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 and Company
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