Some support cells leave little air gaps between them, then make their walls extra thick right around those gaps. That is lacunar collenchyma!
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Lacunar collenchyma cells are a kind of collenchyma: living cells that help hold up young stems.
They are roundish, so small air spaces are left where they meet. The walls are thickest right around those air spaces.
Scientists find this kind in the stems of some plants, for example in plants of the pumpkin family.
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Like all collenchyma, these cells give young stems strong but bendy support, and they stay alive so the stem can keep growing.
The tiny air spaces let air move between the cells, so the living cells inside the stem can get the air they need.
"Lacunar" comes from a Latin word for a gap or a little lake. These cells are named after the gaps between them!