Photo credit WVC
Equisetum sylvaticum and Equisetum pratense – cross section of the stem
Fig. Equisetum pratense GENT 9.jpeg
1970 – Equisetum pratense Ehrh. dans l’Herbier de Kickx (GENT)
by Prof. Dr. Willem Van Cotthem (Ghent University, Belgium)
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https://docs.google.com/document/d/1naaurJ_x1sILp1fYC-kJv531l50QFCjoykYX00xgd88/edit?usp=sharing