SUMMARY 1 The seedling of Tilia vulgaris possesses two typically five-lobed epigeal cotyledons. 2 The cotyledonary lobes vary in size and may show elongation or shortening compared with a common mean type. They may also develop accessory lobes. 3 The aerial parts are thinly pubescent, the hairs present being of two types:–(a) Unicellular ones confined to the epidermal ridges above and below the veins of the cotyledon laminae but generally distributed over the hypocotyl. (b) Club-shaped multicellular hairs confined to the upper surfaces of the cotyledons between the veins. 4 The vascular system is tetrarch in plan and typical root-structure is only attained some distance below the collet. 5 Seedlings showing triarchy or pentarchy also occur. 6 Syncotylous seedlings, where the syncotyly is unilateral and at all pronounced, show triarch symmetry. 7 The polycotylous seedlings examined are pentarch, though the pentarchy occurring in this case is not homologons with that occurring in dicotyls.