Seedlings Hemlock  - Hemlock trees will often be seen growing in straight lines in the forest because the seeds germinated on top of an old log.  Hemlock seed rarely grows where there are old hemlock needles. This is also why large hemlock trees have prop-type roots. The seeds germinated on the cut stump of another tree. 

[Picture of Birch and Hemlock Seedlings.  Source SHIGO 2002 CD's]

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