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Tangential section through a basswood stem

Legend:

1  vessel with helical thickenings
2  vessel with thickenings and pits

English name: Basswood/linden
Scientific name: Tilia sp.
Familia: Tiliaceae
Classis: Dicotyledonas
Phylum: Angiospermae
Regnum: Plantae

Spiral-like thickening provide support to sustain the strong underpressure in the xylem vessels