227 



Tyloses in Brosimlm Aubletii. 



Kathekine E. Golden. 



The wood of Brosimuni Aubk'tii has been given various common 

 names, as leopard-wood, letter-wood, and snake-wood, on account of the 

 mottled appearance of part of its heartwood. It is a very hard, compact 

 wood, dark brown in color, and has part of the heartwood beautifully 

 mottled with black. The mottling is due to the sclerenchymatous tyloses 

 which ttU its tracheae. 



The wood is composed of a mass of fine fibres, nearly round in trans- 

 verse section, and arranged in fairly regular radial rows. The fibres 

 are flattened tangentially when adjoining either parenchyma cells or 



Leopard-wood. Tang. Sect. ( x 300 ) 



trachea?. The tracheae are scattered promiscuously throughout the fibres, 

 either singly or in groups of two to four. They are finely pitted, and con- 

 sist of vessels and tracheides. Parenchyma occurs around the tracheae, 

 sometimes in single rows, sometimes irregularly grouped, also in tangen- 



