La família Urticaceae (ortigues i morelles) a la flora de #SCFarners.

Una família de plantes ben conegudes per la presència de pèls urticants a les Urtica (ortigues) i de pòl·len al·lergogen a les Parietaria (morelles).

#flora #floraSCF #Guilleries #Urticaceae

🔗 https://florascf.cat/la-familia-urticaceae-ortigues-i-morelles/

Another cross section in common nettle (Urtica dioica). #Urticaceae #PlantAnatomy.
It is (was) cultivated as a fiber crop. Bast fibers ([2] on the picture) are located in the secondary phloem. It's easily to spot them with their thick secondary wall (in white). Outside (on the right) is collenchyma [1], whose primary wall of cells are thickened (also white). Inside are located the aligned cells of the wood [3].

More information here : https://www.sciencedirect.com/science/article/abs/pii/S0926669014004920

Sometimes, I harvest plants on my way to work, I take a razor blade and I admire #PlantAnatomy under the microscope.
For today, it is a cross section in a stem of common nettle (Urtica dioica, #Urticaceae). Several vascular bundles are joined by the dark circular cambium (that will generate wood and secondary phloem later). Inside, the pith; a part of it has been degraded. The stem is surrounded by collenchyma, a support tissue.
Of course you can recognize the large stingings hairs.