Microscopic Identification of Japanese Woods

Platycarya strobilacea Sieb. et Zucc.
(Juglandaceae)

GROWTH RINGS

Growth ring boundary

1. Distinct

VESSEL

Porosity	3. Ring-porous
Vessel arrangement	8. Dendritic pattern
Vessel grouping	11. Clusters common
Solitary vessel outline
Perforation plate	13. Simple
Intervessel pits	22. Alternate
Intervessel pit size	26. Medium: 7-10 μm
Vestured pits
Vessel-ray pitting	31. Reduced borders; round/angular
Helical thickenings in vessel elements	36. Present 37. Throughout body of V-elements 39. Only in narrow V-elements
Tangential diameter of vessel lunima	43. >200 μm
Vessel frequency in no./mm2
Mean vessel element length	53. 350〜800 μm
Tyloses and deposits in vessels	56. Tyloses common
Wood vesselless

TRACHEIDS AND FIBRES

Vascular/vascientric tracheids
Ground tissue fibres	61. Minutely bordered pits
Helical thickenings
Septate fibres/Parenchyma-like fiber bands	66. Non-septate fibres present
Parenchyma-like fibre bands
Fibre wall thickness	69. Thin to thick; distinctly open lumina
Mean fibre length	72. 900〜1600 μm

AXIAL PARENCHYMA

Axial Parenchyma
Apotracheal axial parenchyma
Paratracheal axial parenchyma	79. Vacisentric
Banded parenchyma	86. Narrow band < 3 cells wide 88. Scalariform
Axial paremchyma cell type/strand length	92. 3-4 cells/strand

RAY PARENCHYMA

Ray Parenchyma width	98. Larger rays commonly 4-10 seriate
Aggregate rays
Ray height
Rays of two distinct sizes
Rays: Cellular composition	104. All ray cells procumbent
Sheath cells
Tile cells
Perforated ray cells
Disjunctive ray parenchyma cell walls
Ray frequency	115. 4-12 rays/mm
Wood rayless

STORIED STRUCTURE

Storied structure

SECRETORY STRUCTURE AND CAMBIAL VARIANTS

Oil cells/ Mucilage cells
Intercellular canals
Tubes/Tubules
Cambial variants

MINERAL INCLUSIONS

Prismatic crystals	136. Prismatic crystals present 137. In upright/square ray cells 138. In procumbent ray cells
Druses
Other crystal type
Other diagnostic crystal features	156. Crystals in enlarged cells
Silica