MINUTE CHARACTERS. 



9 



tangential diameter is somewhat smaller than the radial diameter 

 because all single pores are slightly elliptical. Walls of the pores are 

 moderately thin, and the cavities of the pores are usually filled with 



d- 



Fig. 5. 



Fig. 4. 



Fig. 3. — Segment of a vessel (separated) from the wood of Cariniana pyriformis, showing the character 

 and arrangement of the pits, also showing the complete absorption of the end walls at c; d, bordered 

 pits. Magnified about 100 diameters. 



Fig. 4. — Wood fiber (separated) of Cariniana pyriformis: a, Slitlike pits; 6, thick wall wood fiber. Magni- 

 fied about 100 diameters. 



Fig. 5. — Wood-parenchyma fiber (separated) of Cariniana pyriformis: a, Individual cells; 6, crystals of 

 calcium oxalate; c, pits and their arrangement. Magnified about 100 diameters. 



tyloses. 1 (Compare transverse section of Cariniana, fig. 6, d, with 

 that of true mahogany, fig. 11, a. A segment or part of a separate 



i Tyloses consist of reddish brown masses of parenchymatous cells which grow through the pits or 

 unthickened portions of the vessel walls and protrude into the vessel cavity. They form partition walls at 

 irregular intervals throughout the entire length of the tube. 



