Chalaza
In the eggs of most birds (not of the reptiles[1]), the chalazae are two spiral bands of tissue that suspend the yolk in the center of the white (the albumen).Nutrients from the plant travel through vascular tissue in the funiculus and outer integument through the chalaza into the nucellus.In most flowering plants, the pollen tube enters the ovule through the micropyle opening in the integuments for fertilization (porogamy).In chalazogamous fertilization, the pollen tubes penetrate the ovule through the chalaza rather than the micropyle opening.[2] Chalazogamy was first discovered in monoecious plant species of the family Casuarinaceae by Melchior Treub, but has since then also been observed in others, for example in pistachio and walnut.
Chalaza (mite)Ancient Greekbird eggsovulesnucellusmicropyleintegumentsfuniculusflowering plantpollen tubepollen tubesmonoeciousCasuarinaceaeMelchior TreubpistachiowalnutList of egg topicsMonotremeFossil recordCephalopodReptiledinosaurPathologyAllergyEgg cellEmbryoIchthyoplanktonOogamyOogenesisOothecaOviductOviparityOvoviviparityOvulationTrophicZygotemembraneAs foodList of egg dishesBenedictBoiledCenturyCoddledCustard dessertsDeep friedDeviledEggnogMeringueOmeletteOnsen tamagoPoachedPowderedPickledQuicheSaltedScotchScrambledShirredSmokedSouffléBalancingCartonDecoratingEaster eggEgg-and-spoon raceEgg drop competitionEggingFabergé eggFree rangeHowToBasicHumpty DumptyOologyOomancyOrganicOvo vegetarianismPysankaVegreville eggRollingTappingTossingdevelopmental biologyplant morphology