Characteristics of the xylem

In the presented material only Loranthus europaeus has distinct rings (Fig. 1). A few other species have somewhat distinct ring boundaries (Fig. 2), but some have no recognizable rings (Fig. 3). Ring distinctness is indicated by semi-ring porosity (Fig. 1) or slight differences in fiber size and cell-wall thickness between the latewood and the earlywood (Fig. 2). Earlywood vessel diameter varies from 20-40 pm and vessel density from 300-1000/mm2.

Vessels are often arranged in radially uniseriate (Fig. 4) or mul-tiseriate groups (Figs. 2 and 5). In some species vessels and fibers cannot be distinguished in transverse section as shown in Phoradendron juniperinum (Fig. 6). Characteristic are short, thick-walled vessels (Figs. 7 and 8) with simple perforations and small, bordered pits, often opposite each other. Pits with round and gash-like apertures have been observed (Figs. 7 and 8). Storied vessels and parenchyma occur in Loranthus europaeus

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