A Wounded Myeloxylon. 
255 
of the wound. Here the whole of the uninjured cortical cells for 
quite a considerable depth have become meristematic, their activity 
resulting in the production of a typical wound cambium. 
ex. cam. 
Fig. 18a. Photomicrograph of wound showing excised tissue (ex.) and 
cambium (cam.). 
Fig. 18b. Portion of 18a more highly magnified. Note the division of the 
cortical cells at (K) and (K 1 ) and the dead suberised cells at (S). 
The actual exterior of the wound is naturally occupied by the 
shrivelled and partially disintegrated tissues originally situated in 
that position, and without doubt corresponding to the dry brown 
mass of dead tissue which is produced when an ordinary fern 
petiole is grazed. Where still distinguishable, the tissues composing 
this appear to be parenchymatous in character, it being highly 
probable that the more resistent fibres were torn bodily away by 
the cause of the injury. 
Situated immediately below this strip of ruptured tissue are 
several rows (from two to seven) of perfectly regularly arranged 
tabular cells, probably already suberised and devoid of contents, 
and on the whole sharply delimited from the former. They are 
