Roll half of pastry to 1/8-inch thickness on a lightly floured surface; fit into a 9-inch pie plate. Chill remaining pastry.
Place huckleberries in pastry shell. Combine 3/4 cup sugar and flour; spoon mixture evenly over berries. Sprinkle with lemon rind and juice. Dot with butter.
Roll remaining pastry to 1/8- inch thickness, and place over filling. Trim edges; seal and flute. Cut slits in top pastry to allow steam to escape. Brush top crust (not fluted edge) with whipping cream; sprinkle with 2 teaspoons sugar.
Bake at 425° for 15 minutes. Reduce heat to 350°; continue baking 20 to 25 minutes. (Cover edges with aluminum foil to prevent over browning, if necessary.)