Abstract: A rotatable thread spool storage tree comprises a vertically extending post which carries a plurality of vertically spaced groups of limbs, the limbs of each group projecting outwardly from the post and being disposed 90.degree. apart. Each limb mounts an arm which is disposed 90.degree. relative to its limb so that the spool mounted thereon bears flush against the associated limb. The arrangement provides for a maximum number of limbs and arms in a given length of post, thereby providing for the storage of a maximum number of thread spools of conventional or large size, or a combination of the two, together with their bobbins, in a minimum of space.