SYNOPSIS.The structure of the hypodermal “pillar”‐cell layer of the testa has been examined in 15 leguminous species and, for each, the diagnostic characters of the testa, as seen in radial section, have been tabulated and figured.In the following species the “pillar” cells formed a single hypodermal layer:Lotus corniculatus, L. ornithopodioides, L. requienii, L. uliginosus, Dorycnium rectum, Ononis arvensis, Psoralea corylifolia, Ornithopus sativus, andMucuna urens.No evidence of an intermediate layer of parenchymatous cells lying between the epidermis and the “pillar” cells has been found in these species.The “pillar” cells form a single hypodermal layer inVoandzeia subterraneaandLotus tetragonolobus.InPhysostigma venenosum1–3 layers of thick‐walled transition cells lie between the single layer of “pillar” cells and the inner layers of thin‐walled parenchyma. InTamarindus indicaa similar arrangement is found but there are many layers of transition cells which are either cubical or stellate in shape or are much compressed.Several layers of “pillar” cells form the hypodermal zone in the testa ofAnagyris fœtidaand ofCopaifera salikounda, the cells of the true hypodermal layer being of somewhat greater radial length than are the remaining cells of this zone. In both species the cells below the hypodermal zone are thick‐walled