Surface Root System of Eucalyptus marginata Sm.: Anatomy of Non-Mycorrhizal Roots.

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Abstract
The anatomy of surface feeder roots of Eucalyptus marginata was investigated. Two types of long roots were recognized: (a) those with thick-walled epidermal cells, and (b) those with a lignified outer cortex. The hypodermis of short roots was often suberized and the inner layers of the cortex had lignified secondary walls. The occurrence of lignified and suberized layers is discussed in relation to possible infection by Phytophthora cinnamomi.