Portuguese white grape variety probably originally from bucelas where most is to be found today. It was once quite commonly planted on the island of Madeira but only about 20 ha grew there in 2010. The name came to be used to denote the lightest, most acid, latest-maturing style of madeira rather than the grape variety from which it was made. On the Portuguese mainland it is also known as esgana cão and is notable for its late ripening and high acidity. It should not be confused with cerceal Branco.