Fig

pits in parenchyma cells

Left Fig. 1. Diffuse-porous xylem with distinct annual rings. Vessels are arranged solitary or in small groups. Root collar of a 50 cm-high hemicryptophyte, riparian, hill zone, Gussing, Burgenland, Austria. Parietaria officinalis, transverse section.

Right Fig. 2. Xylem with growth zones. Most vessels are arranged solitary or in short radial multiples. The blue zone represents tension wood. Stem of a 1 m-high shrub, Laurus forest, subtropical, Tenerife, Canary Islands. Gesnouinia arborea, transverse section.

pits in parenchyma cells

Left Fig. 3. Semi-ring-porous xylem. Vessels contain thin-walled, unlignified tylosis. The ring boundary is marked by unlignified fibers and marginal parenchyma cells. Root collar of a 40 cm-high hemicryptophyte, ruderal site, thermophile zone, subtropical, Tenerife, Canary Islands. Forsskaolea angus-tifolia, transverse section.

Right Fig. 4. Large, laterally elongated pits located in axial parenchyma cells. Root collar of a 50 cm-high hemicryptophyte, riparian, hill zone, Gussing, Burgenland, Austria. Parietaria officinalis, radial section.

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