HdV-238

Taxonomical Group

Planta

Type description

Van geel et al. 1989: During the analysis of macrofossils, several fragments of leaves of dwarf willows were observed (238.a-d). These leaves were too incomplete to permit specific identifications, but they are referable to Salix because of the characteristic epidermis cells with thickened cell walls around ca. 8 μm wide hollows originally bearing hairs (238.d,g and 238.o u). Several stem fragments with an epidermis pattern showing the same hollows (238.g), some of them with leaf scars (238.j) and often with about 1 mm long tongue-shaped bracts (238.e,f and h) were observed. The morphology of the bracts led to the identification of Salix reticulata (see Van Geel and Van der Burgh, 1984). The bracts were inserted next to a leaf scar of a leaf of "normal" size (238.f), but freely placed bracts also occurred (238.e). The bracts always showed a characteristic indentation at the top. Detached bracts (238.i,k n) were of regular occurrence, whereas proper leaves were rather rare. In one case (238.o,p) the fragile epidermal hairs were still present on a bract.

Records

First publication

van Geel B, Coope GR, van der Hammen T (1989) Palaeoecology and stratigraphy of the Lateglacial type section at Usselo (The Netherlands). Rev. Palaeobot. Palynol. 60:25-129.