acalymmate

English

Etymology

a- +‎ calymmate

Adjective

acalymmate (not comparable)

1. (palynology) Forming clusters of pollen grains (usually tetrads or polyads) in which the sexines of the respective grains do not merge to form a continuous sheath.
   • 1996, John V. Freudenstein, Finn N. Rasmussen, “Sectile Pollinia and Relationships in the Orchideaceae”, in Plant Systematics and Evolution, volume 205, →DOI, pages 125–146:

     When loosely associated, each tetrad retains most of its outer exine layer, leading to calymmate tetrads, but an acalymmate massula (since the exine is not continuous around each massula […] ).

Related terms

• calymma