 <unk> <unk> is remote tubular — during <unk> , as the <unk> expands it pushes the young shoot away from the seed . After <unk> , the stem initially grows downward before turning to grow upward and produce the <unk> stem . This produces a " saxophone shaped " <unk> portion of the stem . The fact that the shoot tips of <unk> seedlings are underground it likely to contribute to their fire @-@ tolerance . 
