Thats a long *** chain of unconfirmed transactions.
We start here -> https://blockchain.info/tx/91a10aae5242d6b5f9a3ce29c6e50f9cdbf5e653deaccf6cacd560d4067ec3de?show_adv=true
the red U on the left side indicate unconfirmed inputs. There are 18 transactions that need confirmation before this one can confirm.
If we click the first from the top we end up here -> https://blockchain.info/tx/c2d1ba7ea4f5530a9c9922b9c026789211dfb229e38ea80d68c655ea2dfbfb83?show_adv=true
There are 11 TX that need confirmation before this one can confirm.
Next -> https://blockchain.info/tx/495020ec80a0b649b9dfd874517db92e7b1f5ad710b697ce649a1ad73e9e79f8?show_adv=true
5 TX that need confirmation before this one can confirm.
Next -> ID d5630b8f0a933ab8e9e0e773e5e693d357113f4b9f3b0ea534ad599651a46599 / 3 TX
Next -> ID 6c4e7da44f6adc1f46354e92edafa4b8389bd5f8d004782676f273a37e98b753 / 15 TX
Next -> ID dee482498cd5efa4ea4d9aaf287311876afbdf3b601d8da31100bb21f1ec1d06 / 17 TX
Next -> ID 0583a3ece1c6e8eee79600e2c7bfcdb53fc5eec480bf58a56f58456cb32ced66 / 15 TX
....
7 More jumps -> 70669379e4079c457934c424b2fcd5b7b0c3eb668462465c8e2c441b52f780f9 / all inputs confirmed, yay!
Keep in mind that I only followed one possible path. All of them need to confirm first (can be in the same block though) before your TX can confirm.
Hope it helps a bit.
finally confirmed ... thanks all!