Corm

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1. A short, thickened, underground, upright stem in which food is stored.
2. Compressed underground stem, often enclosed in scale (scale-like) leaves.

corm.gif

This diagram shows the scale (scale-like) leaves pulled away from the root.
Source: http://www.ecy.wa.gov/programs/wq/plants/plantid2/drawings/corm.html

cormold.gif

This year's, last year's and older corms.

Source: http://theseedsite.co.uk/bulbs.html