Vein Anastomoses in the Leaves of Long Shoots of Ginkgo biloba

Abstract

IT has recently been found that four types of vein unions occur in the leaves of Ginkgo biloba L. and that long shoots have a significantly higher average per cent of leaves with anastomoses than short shoots¹. In the present examination of 2,249 leaves collected from 154 long shoots from 16 trees it was found that the leaves from the median portion of the long shoots have a higher per cent of anastomoses than either the basal or apical leaves. It was also found that considerable variation existed in the percentage of leaves with anastomoses in the samples taken from various trees. An average of 33 per cent of the 2,249 leaves had one or more anastomoses; but the range in the individual 16 trees extended from a low of 7.3 per cent to a high of 71.2 per cent.