462 Scientific Proceedings. Royal Dublin Society. 



20. Entandro-phragma utile (Type I.). 

 No. 15-i. Small specimen of sap-wood from the Royal Gardens, Kew, 

 marked " Pseudoeedrela utilis Dawe and Sprague, Uganda, 1906. Coll. 

 M. T. Dawe." PL XXXIIL, figs. 70, 71, 72. 



Lustrous, pinkish-buff. Koey. Parenchymatous laminae close and ochre- 

 coloured, discontinuous and splitting. Rays ochre-coloured. 



C.S. — Vessels scattered, tangentially compressed. M.T.D. = - 26, 4-10 

 groups in 2-mm. field. — Fibres thin-walled. — Parenchyma, circumvasal 1- or 

 2-celled thick, with contents ; also forming wavy laminae 1 —1 cells thick 

 with contents, and continued radially along rays. — Pays with contents. 



T.S. — Rays regular, with parallel sides, about 35 in 2-mm. field ; total 

 width in 2 mm. = 0-36 mm. Height = 0-50, width = 0-049 (1-), 2-, 3-, (4-) 

 ply. Margin indistinct, without crystals. Middle cells same size as margin, 

 often with contents. — Wood parenchyma cells in laminae, and adjoining rays 

 often with crystals. 



R.S. — Fibres septate. 



21. Entandrophragma 'excelsum (Type II.). 

 No. 152, from Royal Gardens, Kew, labelled "Pseudoeedrela excelsa, Dawe 

 and Sprague, Uganda, 1905. Coll. M. T. Dawe." PL XXXIII, figs. 67, 68, 69. 

 No. 186, from propeller of aeroplane. 

 No. 187, from propeller of aeroplane. 

 No. 58, from commercial source, labelled " African Mahogany." 



Colour brown to rose-brown, lustrous and roey. Parenchymatous laminae 

 0'2 mm.-0 - 5 mm. apart in outer region of growth-zone, more sparse within. 

 They are continuous and flat in the outer, somewhat undulating and dis- 

 continuous in the inner region of the zone. The laminae and the rays are 

 rose or orange pink. There is an abrupt transition from one growth-zone to 

 next. Vessels often contain dark, very rarely white, deposit. 



Sp. gr. about - 56. 



C.S. — Vessels isolated or in small groups (radial and tangential). 

 M.T.D. = - 23 mm. 20-30 groups in 2-mm. field. Occasional dark contents, 

 rarely white. — Fibres thick-walled. — Circumvasal parenchyma 1-3 cells thick. 

 Laminar parenchyma 2-10 cells thick, often with dark contents. There is 

 rarely a continuous band of intercellular spaces in these laminae with dark 

 deposit. — Parenchyma sometimes spreads radially along rays. Rays with 

 dark contents. 



T.S. — Rays regular in size, sides bowed about 50-55 in 2-mm. field ; total 

 width of rays in 2 mm. = - 33 mm. Height of rays = - 30 mm,-0-40 mm. 



