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. 2006 Nov;98(5):943–951. doi: 10.1093/aob/mcl183

Fig. 1.

Fig. 1

LM illustrations of pit membrane thickenings in Ericaceae and Oleaceae. Sections (C) and (E) are semi-thin sections stained with toluidine blue; sections (A), (B), (D) and (F) are 10–15 μm thick and stained with safranin and alcian blue. (A) Radial section of Andromeda ferruginea showing even pit membranes in narrow tracheary elements (Tr). (B) Radial section of Dracophyllum strictum showing narrow tracheary elements (Tr) with bordered pits without pit membrane thickenings. (C) Longitudinal section of Arbutus unedo (Ericaceae) showing a single pseudo-torus (arrow) and even pit membranes in narrow tracheary elements (Tr) with helical thickenings. (D) Radial section of Arctostaphylos uva-ursi (Ericaceae) with various pseudo-tori (arrows) in narrow tracheary elements (Tr). (E) Radial section of Empetrum hermaphroditum (Ericaceae). Surface view of bordered pits with thickenings (arrows) on pit membranes. Note two thickenings associated with the upper pit membrane. (F) Tangential section of Osmanthus serrulatus (Oleaceae) showing narrow tracheary elements (Tr) with tori (arrows).