Fig. 5

Wood anatomy of selected Notobubon species. A Notobubon tenuifolium (TS): an indistinct growth ring boundary is present in the middle of the photo, marked by layers of radially flattened fibres. B Notobubon capense (TS): three growth ring boundaries are present (two of them very distinct), marked by change of fibres from moderately thick-walled in earlywood to thick-walled and very thick-walled in latewood, and also by change in vessel diameter. Vessels are concentrated mostly in fascicular regions. C Notobubon striatum (TS): a diagonal to dendritic vessel disposition, very thick-walled fibres, and paratracheal parenchyma in incomplete sheaths are well-marked in this species. D Notobubon pearsonii (TLS): uni- and narrow multiseriate rays and intervessel alternate pitting typical of all Notobubon species. E Notobubon tenuifolium (RS): rays composed of exclusively of procumbent (upper), and mixed types of cells (lower), vessel-ray pitting alternate. F Notobubon gummiferum (RS): simple perforation plate and alternate to scalariform vessel-axial parenchyma pitting