11.   The birch trees shed their aluminium crust,

12.   An inch-worm had just fallen on it from a birch tree, and when I looked around, they seemed everywhere.

13.   A screen of thin birch trees extends the effect of veiling into the landscape.

14.   Have you ever seen Chekhov without a birch tree?

15.   He painted the windows of his home black and cut the shading branches of a pitiable birch tree on his lawn down to lifeless stumps.

16.   Heads popped out of windows, craning to see around a birch tree to the spectacle beyond.

17.   I climbed tall birch trees and got grass-stained knees and picked up garter snakes.

18.   I was thinking about this last weekend as I looked at birch trees shiny with ice.

19.   In winter, rust-colored leaves from birch trees tessellate the snow.

20.   It has been about five years since the first birch trees were tapped in Alaska to produce birch syrup to sell commercially.