RT @Hcomosa@twitter.com

Je vois que vous êtes 2 000 à me suivre, ça fait plaisir, merci à toutes et tous !

Pour fêter ça, je vous propose une jolie coupe microscopique. #PlantAnatomy

1/6

🐦🔗: https://twitter.com/Hcomosa/status/1660894396198289408

Almond bud scale next to the dissection tool for scale. The pick of the dissection tool is about the same size as a sewing pin.

I have yet to figure out a way to flatten the scales for measurement without tearing them.

#PlantMorphology #almond #botany #dissection #PlantAnatomy #PlantScience

Almond bud scale next to the dissection tool for scale. The pick of the dissection tool is about the same size as a sewing pin.

I have yet to figure out a way to flatten the scales for measurement without tearing them.

#PlantMorphology #almond #botany #dissection #PlantAnatomy

This picture is ugly, but you can see the leaf encircling the stem. #Poaceae #PlantAnatomy

The whole leaf looks like that. It is circular, because it is a sheath around the stem (at least the lower part). #Poaceae #PlantAnatomy

This is an amazing hat, isn't it? It is made up of fibre cells, covering a head-shaped vascular bundle in a leaf of a velvet grass (Holcus lanatus, #Poaceae). #PlantAnatomy

Full cross section #PlantAnatomy

I forgot to highlight the ring of fibers between the chlorenchyma and the outermost vascular bundles. #PlantAnatomy

This is a cross section in a ridged stem of a cockspur (Echinochloa crus-galli, #Poaceae). Look at the head-shaped vascular bundles, the chlorenchyma (in green) and the fibres bundles at the top of each ridge (in white). #PlantAnatomy

One of my favourite structures in #PlantAnatomy are the vascular bundles of monocots.
"Smiling faces", "Clown faces" or "Skull faces" depending on the species and on your point of view. ;)
Here at the periphery of the stem of a rush (Juncus sp., #Juncaceae).

Today's cross section is a stem of pea (Pisum sativum, #Fabaceae).
A square and hollow stem with a dozen of vascular bundles :
- Inner dark region with white circles = xylem with its vessel elements ;
- Outer light region = phloem.
Outside phloem : fibers, especially in the corners.
#PlantAnatomy

What is this wheel-like structure?
A cross section in a root from a cockspur (Echinochloacrus-galli, #Poaceae), a common grass here in Belgium! #PlantAnatomy

The underside of a fern is covered in sori, the singular is sorus, which are covered by the indusium. The indusium protect the sporangia (the ball things full of spores) until they are mature and appropriate environmental conditions are met. Attached are 3 photos to provide scale the best one, in my opinion, has a bit of 5mm pencil lead and a single sporangia on the tip of the forceps.
#plant #botany #fern #PlantAnatomy

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

I took a tube of ethanol to harvest some material and then cutting it in the lab for an outstanding observation under the microscope. #PlantAnatomy
Look at the terrifying faces; those are the vascular bundles. Large eyes and the nose are xylem vessels, whereas the forhead is phloem.

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.