The female gametophyte structure that produces eggs in nonvascular plants are called archegonia. The male structure that produces sperm are called antheridia. A gametophyt â¦ e is the part of the plant that is responsible for creating gametes AKA sexual reproductive cell (sperm or egg).
All American Express cards begin with '37,' followed by currency indicator (digits 3, 4), account number (digits 5-11), card number within account (digits 12-14), and check digit (digit 15).
Originally Answered: Why does American Express (company) use a different grouping of numbers than other credit cards? Visa and Mastercard always have 16 digits whereas American Express has 15 digits. Visa and Mastercard do not issue credit cards; instead, they use banks (financial institutions) to issue the cards.