(a)
(b)
(c)
(d)
Figure 3: Histological sections of Griselinia racemosa roots with salivary sheaths of Mapuchea chilensis. (a) Branched sheath, with one branch penetrating into the xylem. (b) Sheath terminating in the outermost layer of the xylem. ((c) and (d)) Sheath terminating equivocally, between the phloem and the xylem.