Dixon — Mahogany, Recognition of some Different Kinds. 463 



Width = 0*05. (1-), 2-. 3-, 4-ply. In some specimens 4-ply rays' are rare. 

 Margin of one cell, distinct, often with crystals. Middle cells of rays ; often 

 moderately thick- walled, with contents. — Parenchyma often applied to rays; 

 many cells contain crystals. 



R.S. — Fibres septate or non-septate. 



Note. — Probably in this type there are at least two species. Nos. 152 

 and 58 have rays which appear more bowed, and the cells more bulged in 

 T.S. than are those of Nos. 186 and 187. 



Specimen. 58 includes the pith and a considerable thickness of the wood. 

 It was observed that T.S. made near the pith exhibited as many as 80 rays 

 in 2-mm. field. 



22. Entandrophragma candollei (Type III.). 



No. 317, from the Conservator of Forests, Central Circle, Nigeria,, labelled 

 " Entandrophragma candollei or scented mahogany." 



No. 74, from commercial source, labelled " African mahogany, Sapele, 

 slightly scented." PI. XXXIV., figs. 73, 74, 75. 



No. 221, from commercial source, labelled " African mahogany, Sapele, 

 with dapple." 



No. 300, from commercial source, labelled " Sapele mahogany, shipped 

 from Sapele, Nigeria." 



Rich red brown, lustrous and roey. Rays and parenchymatous laminae 

 pink brown. Scented. Parenchymatous laminae 0-3 mm.-30'mm. apart; 

 close in outer region, and spaced widely in inner region of growth-zones. 

 Vessels rare in inner region of growth-zones. Sp. gr. = 0'56-0 - 74. 



C.S. — Vessels isolated, or in small groups of 2-4. M. T. D. = 0-24 mm., 

 30-40 in 2-mm. field. Occasionally with dark contents. — Fibres thick-walled. 

 Circumvasal parenchyma 1-3 cells thick, distinct ; spreading irregularly from, 

 vessels. Laminar parenchyma 2-10 cells thick, occasionally with contents. 

 Scattered parenchyma occasionally adjoining rays. — Pays conspicuous, usually 

 with contents. 



T.S. — Pays fairly uniform in size and in irregular oblique series, 30-35 in 

 2-mm. field. Total width in 2 mm. = 0-30-0-72 mm. Height (average) = 

 0-45-0-50 mm., 15-25 cells. Width = 0-05-008 mm., (1-), 2-, 3-, 4-, 

 (5-, 6-) ply. Margin distinct, with crystals. Middle cells often with 

 contents. Parenchyma sometimes with crystals, especially in contact with 

 rays. 



R.S. — Fibres septate. 



Note. — Mell (10) states that Sapeli mahogany is derived from Entandro- 

 phragma candollei, Harms. No. 74 seems probably a species distinct from 



SOIENT, PBOC. R.D.S., VOL. XV., NO. XXXIV. 4 D 



