eu·spo·ran·gi·a·tae \ˌyüspəˌranjēˈäd.ˌē, -ˈād.-\noun plural Usage: capitalized Etymology: New Latin, from feminine plural of (assumed) New Latin eusporangiatus in some classifications: a group comprising all the ferns in which sporangium formation is eusporangiate — compare leptosporangiatae