MC-294832x2 Spruce use Oak Leaves
Appears to be fixed as of 13w43a, with the introduction of the Roofed Oak species! 
Original report follows:
Old bug report
The 2x2 Spruce that spawn in Covered Forest biomes use Oak leaves instead of Spruce leaves.
ie.
They look like Oak leaves.
Pick block gives Oak leaves.
They drop Oak saplings and Apples.
Regular spruce are fine, afaik.
2013-09-05, 06:52 PM
2015-02-07, 01:50 PM
2013-10-22, 01:08 AM
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