acalymmate

Definition from Wiktionary, the free dictionary
Jump to: navigation, search

English[edit]

Etymology[edit]

a- +‎ calymmate

Adjective[edit]

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”, Plant Systematics and Evolution, volume 205, DOI:10.1007/BF01464400, 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[edit]