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).
Here are what some of the numbers stand for: The first digit in your credit-card number signifies the system 1  : 3 - travel/entertainment cards (such as American Express and Diners Club).2  4 - Visa. 3  5 - MasterCard.4  6 - Discover Card.he first digit in your credit-card number signifies the system 1  : 3 - travel/entertainment cards (such as American Express and Diners Club). 2  4 - Visa. 3  5 - MasterCard. 4  6 - Discover Card.