Collenchyma		hi-res links (requires broadband)
Curtis, Lersten, and Nowak 2002 rev. 2015

Ambrosia (ragweed) stem freehand cross section: collenchyma.

Helianthus (sunflower) stem cross section with collenchyma in the cortex.

Ricinus communis (castor bean) stem cross section with collenchyma under the epidermis.

Aesculus (horse chestnut) stem cross section with collenchyma in cortex.

Fraxinus (ash) petiole cross section with patches of collenchyma in cortex.

Fraxinus (ash) petiole cross section closeup showing cortex collenchyma patch.

Cucurbita stem cross section with collenchyma (just below the epidermis) and sclerenchyma toward the middle.

Cucurbita stem cross section with patch of collenchyma under the epidermis and an inner ring of sclerenchyma.

Cucurbita stem longisection with parenchyma, sclerenchyma, and collenchyma.

Stem longisection with collenchyma.