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).
On American Express cards, the card security code is the four digits printed (not embossed) on the front towards the right. The card security code is not encoded on the magnetic stripe but is printed flat. 1  American Express cards have a four-digit code printed on the front side of the card above the number. 2  Diners Club, Discover, JCB, MasterCard, and Visa credit and debit cards have a three-digit card security code.