Abstract
Ultracryotomy, which gives anin situ visualization of wall subunits, was used to study the texture of elongating wall of mung bean hypocotyl (Phaseolus aureus). The criss-crossed texture of the wall was confirmed. The controversed disposition of the subunits in twisted patterns was analyzed on the basis of observations of oblique sections on which a mild extraction may be performed. Despite the twisted appearance within one sectioning plane, no curved subunits were seen running between the criss-crossed layers. The results confirmed that the appearance of arcs is an illusion due to thin sectioning of successive strata in which the orientation of subunits rotates.
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