1. Collenchyma

2. Types of Collenchyma Angular collenchyma Lamellar collenchyma
Lacunar collenchyma
Annular collenchyma

3. Angular collenchyma in angelica stem
Early development of collenchyma
Mature stem

4. Angular collenchyma in celery

5. Apium (celery) petiole
Angular collenchyma
Apium (celery) petiole
Rumex (dock) stem

6. Angular collenchyma in burdock petiole
Helicoid arrangement of cellulose microfibrils give the appearance of a multi-layered wall in thicker wall areas
In thin areas of wall cellulose microfibrils are longitudinal

7. Ivy angular collenchyma

8. Collenchyma in Curcubita stem

9. Nymphaea angular collenchyma

10. Angular collenchyma in parsnip stem

11. Petiole of pumpkin leaf

12. Collenchyma in ice plant leaf

13. Lamellar collenchyma in cosmos stem

14. Lamellar collenchyma in castor-bean stem

15. Lamellar collenchyma in Sambucus stem

16. Semi-lamellar collenchyma in birch petiole

17. Lacunar collenchyma in Datura stem

18. Annular collenchyma in carrot petiole