Vasculum
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A vasculum is a container used by botanists to keep field samples viable by maintaining a cool, humid environment. Vascula are typically flattened tin cylinders carried horizontally on a strap (so the specimens lie flat) lined with moistened cloth.
[edit] References
http://www.public.iastate.edu/~herbarium/inps/oct01.htm
http://garance.voyageuse.free.fr/botanique/dep_bota3.htm (French, with image)