Perrine Yellow Transparent apple

Perrine Yellow Transparent is bud-sport (natural mutation) of WhiteTransparent.  It has double the number of chromomes (4 instead of 2) found in most apples, and as a result tends to become a fairly large vigorous tree.

The apples are very large, ripen very early (late July), and have a basic acidic flavor which becomes sweeter when fully ripe.  They are mainly used for cooking, and the flesh quickly cooks down to a creamy sauce - for cooking purposes it is best to pick the apples when still green.

Like White Transparent, the tree is winter-hardy - down to zone 3.  The tree is fairly disease-resistant, but susceptible to fireblight (although perhaps not quite to the extent that White Transparent is).