massula
/ˈmasjʊlə/Botany
noun
1In certain orchids: any of the clusters of pollen grains, each developed from a single cell, which make up a pollinium.
2In aquatic ferns of the families Azollaceae and Salviniaceae: a rounded mass of cytoplasmic foam, having hooked bristles in many species, enclosing a group of microspores.
Origin
Mid 19th century; earliest use found in John Stevens Henslow (1796–1861), botanist and Church of England clergyman. From classical Latin massula little lump from massa + -ula.