| |
 |
|
|
| |
Prunus spinosa L.
|
Stone Fruit: Blackthorn
|
Rosaceae
|
| |
 |
| |
Transversal section |
|
|
| |
Semi-ring-porous to diffuse-porous. Pores solitary and in radial pore multiples and pore clusters. Diffuse- to semi-ring-porous wood. Growth ring boundaries distinct, marked by abrupt transition in pore size from latewood to earlywood, occasionally indistinct, depending on growth conditions. Fibres in ground tissue almost exclusively thickwalled. Gum deposits in heartwood vessels. Diffuse apotracheal parenchyma. |
                    
|
| |
| |
Radial section |
|
|
| |
Simple perforation plates. Spiral thickenings, typically widely spaced. Uniseriate rays generally square to upright cells, multiseriate rays heterogeneous, often square and upright ray cells. Occasionally rhombic crystals and crystal druses in rays. Distinct spiral thickenings in vessels and fibre-tracheids. Libriform fibres absent. |
   
|
| |
| |
Tangential section |
|
|
| |
Uniseriate and 4- to 6-seriate rays, frequently larger than 6 cells wide. Oval, multiseriate ray cells. Occasionally sheath cells. Average ray height: 30 to 70 cells, often higher than 4mm. |
   
|
| |
| |
Key characters |
|
|
| |
Semi-ring- to diffuse-porous. Uniseriate and multiseriate (4- to >6-seriate), heterogeneous rays. Simple perforation plates. Spiral thickenings. |
| |
|
