GUIDE TO TIMBERS OF NIGERIA 87 



46. Colour light brown (fawn colour) splashed with lustrous 



patches ; concentric lines of parenchyma nearly as 

 wide as the darker zones 'between them (cf. tr. sec., 

 fig. 4, PI. II) . . . Guarea, page 24 



460. Nut-brown ; concentric lines very fine 



Oregbd Erin, page 79 



47. Rays in cross-section, light brown or colourless (cf. tr. 



sec., fig. 3, PI. IV) . . '... . Lovoa, page 28 



47a. Rays red in transverse section ; in radial section they 



are prominent and pretty flakes . Uapaca, page 69 



48. Rays in radial section (quarter) are very narrow lines 



about r ^ inch or less (cf. tr. sec., fig. 2, PI. IV) 



Khaya, page 26 

 480. Rays rfi radial section rather broad flakes (about inch 



high) . . ' . Uapaca, page 69 



49. Pores isolated (cf. tr. sec., fig. 3, PI. Ill) 



Erythrophleum, No. 2997, page 46 



490. Pores connected by light-coloured lines in transverse 

 section (cf. fig. 2, PI. II) 



Pterocarpus, No. 3623, page 31 



50. Pores not connected in cross-section by light-coloured 



lines ; wood of a purplish-brown colour 



Saccoglottis, page 21 



500. Some of the pores are connected by light-coloured 

 tissue ; wood chestnut-brown in colour (cf. tr. sec., 

 fig. 3, PI. Ill) . Erythrophleum, No. 3292, page 43 



51 . Colour a warm brown ; concentric lines of parenchyma 



nearly as wide as the zones of dark tissue between 

 them (cf. tr. sec., fig. 4, PI. II) . Guarea, page 24 

 51 a. Colour dirty white ; concentric lines obscure, few and 

 wide apart (cf. tr. sec., fig. 5, PI. IV) 



Terminalia superb a, page 53 



NOTES TO THE KEY 



1. Transverse section is always to be understood unless otherwise specified. 



The method of preparation of the surface of the wood is as stated 

 in each schedule under " Transverse section." 



2. " Vasicentric, peri vasal or paratracheal " parenchyma, which we refer 



to for the sake of brevity as P. (a) is well shown in all figures on 

 Plates II and IV, and diagrammatically in figs. 1, 4, 5 and 7-9, 

 PI. I, where it is reduced to simple narrow aureoles around the 

 orifices of the vessels. When better developed it may extend to 

 wings or even long lines (figs. 2 and 3, PI. I, and all figures on 

 PI. II), but it is always in intimate connection with the vessels. 

 Before coming to a decision, the vertical sections should be examined, 

 as this kind of parenchyma, when very scanty and scarcely visible 

 oh the transverse section, may come out as borders or tails to the 

 pores on a vertical section. 



