vasculum
Concise Oxford English Dictionary © 2008 Oxford University Press:
vasculum /ˈvaskjʊləm/
▶noun (pl. vascula /-lə/) a container used by botanists when collecting plants, typically a flattened cylindrical metal case with a lengthwise opening.
– origin C18: from L., dimin. of vas ‘vessel’.
'vasculum' also found in these Oxford entries:

