Bark about 0.2 to 0.8 mm thick occurring in closely packed compound quills made up of single or double quills．Which of the following is not true（）

A．皮，厚0.2-0.8mm
B．呈复卷状
C．可由单卷重叠成复卷状
D．可由双卷重叠成复卷状
E．可呈片状