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Root tips of Hyoscyamus niger were cultivated on agar or in liquid medium, and patterns of elongation and branching were investigated. The elongation of roots compared to branching, particularly tertiary root branching, was more effective in liquid medium than on agar medium. The number (0.06 per cm) of tertiary roots which branched out from secondary roots was far less than that (4.2 per cm) of secondary...
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