Plant tissues. Collenchyma.
Species: ivy (Hedera helix).
Technique: paraffin embedding, section stained with methylene blue.
In the angular collenchyma, the cell wall thickenings occur at the angles of the cell surface where several cells converge, hence the absence of intercellular spaces in this tissue. The thickenings are like pillars arranged longitudinally in the plant body, providing great mechanical resistance.