Occurrence of simple, multiple, and combination perforation plates in the vessels of New Zealand woods

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Abstract
Perforation plates between vessel members were examined in the woods of 117 New Zealand species belonging to 38 dicotyledonous families. Woods with exclusively simple and exclusively scalariform plates as well as a number of woods possessing more than one perforation plate type are tabulated and illustrated with scanning electron micrographs. Most of the genera possessing more than one perforation plate type also have simple to scalariform or simple to reticulate combination plates. The retention of occasional multiperforate or multiperforate to simple combination plates in woods with otherwise exclusively simple plates, present some interesting sequences for the nossible evolution of the simple perforation plate from the more primitive multiperforate forms.