Dixon — Mahogany, Recognition of some Different Kinds. 474. 



33. Cedrela toona. 

 No. 239, from Eoyal Botanic Gardens, Kew, labelled " Cedrela toona 

 Eoxb., Simla, Punjab. Section cut from India Forest Department specimen 

 marked H 8 (see ' A Manual of Indian Timbers,' Gamble, 1902, p. 159)." 

 PI. XXXVIII., figs. 100, 101, 102. 



Dark red brown, lustrous, roey. Vessels distinctly zoned. Zones with 

 large vessels, separated by usually wider zones, composed, of denser tissue, 

 with a few vessels scattered in them. Dense zones of very uneven thickness, 

 sometimes almost disappearing, so that the vascular zones approach one 

 another and run together. Parenchymatous laminae, usually in vascular 

 zones, sometimes in dense zones, and then with black deposit. Pays distinct 

 and lighter red than rest of wood. 



C.S. — Vessels compressed tangentially, isolated, or in radial groups of 2 or 3, 

 often showing perforated end wall ; M.T.D. = 0*30 mm., 4-12 in 2-mm. field ; 

 empty. — Fibres thin to moderately thick- walled ; 6-23 between rays. — 

 Circumvasal parenchyma narrow ; laminar parenchyma narrow, 3 or 4 cells 

 thick on inside of vascular zone, occasionally in dense zone with schizogenous 

 spaces filled with dark deposit. — Pays distinct, almost empty. 



T.S. — Rays irregular in size and arrangement, sides bowed ; about 40 in 

 2-mm. field. Total width in 2 mm,'= 044 mm. Height = 0-05-043-0-60 mm., 

 3-25 cells. Width = 0-02-0-08-0-10 mm. ; 1-, 2-, 3-, 4-, 5-ply. Margin often 

 distinct ; outline of middle cells rounded, often bulging into fibres. — Fibres 

 septate. 



U.S. — Ray cells short and rectangular, angles filled with deposit; marginal 

 cells nearly square or pentagonal. — Circumvasal parenchyma of rectangular 

 cells, angles often filled with deposit. — Segments of vessels often as short as 

 or shorter than diameter. — Fibres septate. 



34. Cedrela australis. 

 No. 196, from the Museum of Economic Forestry, Sydney, N.S.W., marked 

 "Red Cedar, Cedrela australis F. v. M." Plate XXXIX., figs. 103, 104, 105. 



Rose brown, lustrous, not (?) roey. Large vessels in zones, occasionally with 

 white contents ; dark contents also occasional. Parenchymatous laminae 

 1 mm. -4 mm. apart ; in contact with the zones of large vessels. Sp. gr. = - 49. 



C.S. — Vessels round, scattered, or in small radial groups ; M.T.D.=0 - 32mm., 

 10-20 groups in 2-mm. field, occasionally filled with dark contents. — Fibres 

 thin-walled, radially compressed in dense part of growth-zone. — Parenchyma 

 circumvasal, inconspicuous, and in tangential laminae 3-5 cells thick, empty. 

 — Rays empty. 



SOJENT. PROC. R.D.S., VOL. XV., NO. XXXIV. 4 E 



