Where does “megarchesporio” come from?

megarchesporio (Italian) comes from Italian archesporio, from Italian spora, from Latin spora, from Ancient Greek σπορά, from Ancient Greek σπείρω, from Proto-Hellenic spéřřō, from Proto-Indo-European spéryeti, from Proto-Indo-European sper- — to fidget, twitch; to push; to be quick; to...

megarchesporio (Italian): the cells that give rise to megaspores