12.2: Secondary Growth
- Page ID
- 35379
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Full Stem Cross Sections, Pinus
![A cross section of a 1 year old pine stem](https://bio.libretexts.org/@api/deki/files/27416/IMG_20200610_113845.jpg?revision=2&size=bestfit&width=676&height=630)
![An older pine stem cross section](https://bio.libretexts.org/@api/deki/files/27417/IMG_20200610_113947.jpg?revision=2&size=bestfit&width=686&height=586)
Vascular Tissue
![A close up on the annual growth rings in the pinus stem](https://bio.libretexts.org/@api/deki/files/27418/Pinus_stem_annual_rings.jpg?revision=2&size=bestfit&width=729&height=548)
![A close up on the vascular tissue in the pine stem](https://bio.libretexts.org/@api/deki/files/27419/Pinus_stem_vascular_cambium.jpg?revision=2&size=bestfit&width=626&height=471)
Periderm
![A magnified view of the periderm in a pine stem](https://bio.libretexts.org/@api/deki/files/27451/Periderm_BCC_Flickr.jpg?revision=2&size=bestfit&width=806&height=379)
Wood
![Annual growth rings on a driftwood stump, indicated by black arrows](https://bio.libretexts.org/@api/deki/files/27454/Annual_growth_rings.jpg?revision=2&size=bestfit&width=640&height=480)
![A cut log with green slime (likely algae and/or cyanobacteria) in the sapwood, but not in the heartwood](https://bio.libretexts.org/@api/deki/files/27452/Heartwood_vs_sapwood.jpg?revision=2&size=bestfit&width=352&height=417)
![A cut log with moss and algae in the sapwood, but not in the heartwood](https://bio.libretexts.org/@api/deki/files/27453/Heartwood_vs_sapwood_2.jpg?revision=2&size=bestfit&width=345&height=415)
Angiosperms
![A cross section through a tree (also called a wood cookie)](https://bio.libretexts.org/@api/deki/files/30117/Inked1920px-Cross-section_of_an_Oak_Log_Showing_Growth_Rings_LI.jpg?revision=1&size=bestfit&width=772&height=580)
![A cross section of a woody angiosperm stem](https://bio.libretexts.org/@api/deki/files/27420/IMG_20200610_114044.jpg?revision=2&size=bestfit&width=685&height=615)
![Vascular tissue in an oak stem](https://bio.libretexts.org/@api/deki/files/27421/Quercus_stem_vascular_tissue.jpg?revision=3)
![A lenticel in the periderm of an oak](https://bio.libretexts.org/@api/deki/files/27422/Quercus_stem_periderm_lenticel.jpg?revision=2&size=bestfit&width=765&height=576)