Polyad vs Acalymmate - What's the difference?
polyad | acalymmate |
A group consisting of an indeterminate number of things or people.
(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.
* {{quote-journal, 1996, John V. Freudenstein & Finn N. Rasmussen, Sectile Pollinia and Relationships in the Orchideaceae, Plant Systematics and Evolution, pages=125-146, volume=205, doi=10.1007/BF01464400
, passage=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