If a photosynthetic form of land coral evolved, it could grow to large size using a built substrate consisting of the skeletal remains of previous individuals. You might get a coral-like colonial tree structure, raising the individual phytocoral higher that their rivals in a quest for sunlight. More like a land stromatolite, really. In regions where the rock is mostly calcite such a structure might be doable.
Except that such a structure would face the same problems a tree faces; the phytocoral would need to obtain water and minerals from the soil. So the land phytocoral would need to have fluid transport systems similar to xylem and phloem in its structure; it may just be possible for colonial organisms to form specialised tissues capable of nutrient transport alone.
Carbonic acid could form and eat away the coral- unless it was protected by a living outer skin.
Basically I am describing a colonial tree with a calcareous heartwood instead of a woody heart. Not impossible; but perhaps such organisms would be out-competed by woody trees in most cases.
I can't see much advantage for animal-like land coral; sea coral adopts that habit to pluck food particles floating in the water; unless the atmosphere is thick enough to have numerous food particles suspended in it, a land coral is not a very sensible form for a heterotroph.
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