Anatomical Study on the Root of Rhus Suecedanea, Especially on the Resin Canal

Abstract

I have studied about the anatomical structure of the root of Rhus succedanea espe cially on the resin canal; and the essential points are:-
1) There are four fibrovascular bundles in which each phloem has one resin canal in the youngest root when we see the cross section of it through the microscope, and each resin canal finds its way from the root to the stem, and runs together with these fibrovascular bundles having no anastomose in the node to the end of the root.
2) A root of 3-4 year's growth has 4-6 resin canals in the outerside of the cortex at a nearly equol distance, but we see 10-20 resin canals arranged almost circularly in one row and sometimes two in the innerside of it, but the larger 4-6 resin canals in the outerside reach to the end of the root. There are 4-5 resin canals even in the smaller lateral root.
3) There are many groups of stone cells in the cortex of the old root, The resin canals are distributed irregularly different sizes in the root, 6-10mm in dia. There are six large resin canals distributed regularly in the outerside of the cortex of the lateral root, 2mm in dia.; and the secondary resin canals are found irregularly in the innerside of it. But, on the contrary, in the smaller root, 0.1-0.5mm. in dia. We can not these secondary canals, even if there are 4-6 resin canals in it.
4) Rhua succedanea has neither resin canals in the pith nor groups of bastfibre in the cortex of the root, young or old.