The New Encyclopaedia Britannica, Volume 7Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 238
... gametophyte N archegonium rhizoids sperm zygote MITOSIS lue root 48 000 HAPLOID GENERATION Figure 1 : Fern life cycle . Drawing by M. Pahl gametophyte MEIOSIS antheridium spore -prothallus where they occur in fissures and crevices of ...
... gametophyte N archegonium rhizoids sperm zygote MITOSIS lue root 48 000 HAPLOID GENERATION Figure 1 : Fern life cycle . Drawing by M. Pahl gametophyte MEIOSIS antheridium spore -prothallus where they occur in fissures and crevices of ...
Page 239
... gametophyte . When the spore wall cracks under appropriate moist conditions , the fern gametophyte is formed . Emerging from the spore at the time of germi- nation are a nongreen rhizoid ( rootlike organ ) , which attaches the plant to ...
... gametophyte . When the spore wall cracks under appropriate moist conditions , the fern gametophyte is formed . Emerging from the spore at the time of germi- nation are a nongreen rhizoid ( rootlike organ ) , which attaches the plant to ...
Page 240
... gametophytes is accomplished by continued growth and fragmentation , but this does not spread the gametophyte very far . Some subfamilies ( Vittarioideae , Grammitidoideae , Hymenophylloideae ) produce specialized filaments , or gemmae ...
... gametophytes is accomplished by continued growth and fragmentation , but this does not spread the gametophyte very far . Some subfamilies ( Vittarioideae , Grammitidoideae , Hymenophylloideae ) produce specialized filaments , or gemmae ...
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