The AlgaeMacmillan, 1973 - 497 pagine |
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Risultati 1-3 di 64
Pagina 49
... gives rise to a new colony . The gametophytic colonies are monoecious or dioecious , depending on the species , and give rise to biflagellate isogametes . The zygote gives rise to four to eight aplanospores that are said to grow into ...
... gives rise to a new colony . The gametophytic colonies are monoecious or dioecious , depending on the species , and give rise to biflagellate isogametes . The zygote gives rise to four to eight aplanospores that are said to grow into ...
Pagina 217
... give rise to a new ' streblonema ' generation . No investigator , under such conditions , has however succeeded in obtaining macroscopic plants again and so it has been suggested that sex has been inhibited in these plants . ( Dangeard ...
... give rise to a new ' streblonema ' generation . No investigator , under such conditions , has however succeeded in obtaining macroscopic plants again and so it has been suggested that sex has been inhibited in these plants . ( Dangeard ...
Pagina 272
... giving rise to four nuclei ; these pass into pro- tuberances that form from the carpogonium and then branch to give a mass of gonimoblast filaments . Each branch terminates in a sporangium that produces a single naked carpospore . On ...
... giving rise to four nuclei ; these pass into pro- tuberances that form from the carpogonium and then branch to give a mass of gonimoblast filaments . Each branch terminates in a sporangium that produces a single naked carpospore . On ...
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algae algal antheridia antherozoids apex apical cell aplanospores arise asexual Asexual reproduction auxiliary cell basal belt biflagellate Biol carpogonial branch carpogonium carpospores cell division cell wall Chapman Chlorophyceae chlorophyll chloroplasts Chrysophyceae colony colourless conceptacles cortex cortical Cyanophyceae cystocarp cysts cytoplasm develop diatoms dinoflagellates diploid divides Enteromorpha epiphytes factor fertilization filaments flagella flagellates flagellum flora formation freshwater Fritsch frond Fucus fuse gametangia gametes gametophyte gelatinous genera genus germinate give rise gonimoblast grow growth hairs haploid Hormosira Laminaria lateral layer light intensity littoral marine marshes meiosis membrane morphological motile nucleus occur Oltmanns oogonia oogonium organs Phaeophyceae photosynthesis phyceae Phycol plankton plants plurilocular possess present produced protoplast pyrenoids rhizoids Rhodophyceae Sexual reproduction sheath Siphonales soil species sporangia spores sporophyte stage stalk stipe structure swarmers temperature tetrasporangia tetraspores thallus threads tide Ulothrix Ulva unilocular sporangia vegetative cell vesicle Xanthophyceae zone zoospores zygote