Robuta

https://www.semanticscholar.org/topic/Ubisch-body/665737 Ubisch body | Semantic Scholar A small, granular structure that is found in the extracellular matrix of cell of the secretory tapetal layer that surrounds developing pollen grains. Ubisch... bodysemanticscholar https://nrc-publications.canada.ca/eng/view/object/?id=21094170-97bb-4d9c-917c-41781231a299 The classical Ubisch bodies carry a sporophytically produced structural protein (RAFTIN) that is... The classical Ubisch bodies carry a sporophytically produced structural protein (RAFTIN) that is essential for pollen development