Data from: Mesozoic cupules and the origin of the angiosperm second integument

Gongle Shi, Fabiany Herrera, Patrick Herendeen, Elizabeth Clark & Peter Crane
The second integument of the angiosperm ovule is unique among seed plants, with developmental genetics that are distinct from those of the inner integument. Understanding how the second integument should be compared to structures in other seed plants is therefore crucial to resolving the long-standing question of the origins of angiosperms. Attention has focused on several extinct plants with recurved cupules that are reminiscent of the anatropous organization of the basic bitegmic ovules of angiosperms,...
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17 downloads reported since publication in 2021.

These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?