Morus nigra

Morus nigra L. – Black mulberry

group: 	RING-POROUS HARDWOODS

Macroscopic structure of wood

heartwood/sapwood: 	heartwood

description: 	narrow sapwood (1–3 cm), yellowish; heartwood yellowish brown to chocolate brown

rings: 	distinct boundary between rings; distinct zone of early wood and late wood in rings

vessels	macro pores in early wood (X – holes, R, T – grooves), micropores in late wood (arrangement)

microvessels arrangement: 	nested arrangement

rays: 	visible ray flecks, visible only in R

texture: 	flatsawn (T), radial figure (R); very decorative wood

Microscopic structure of wood

brief overview: 	Rays 1–9 seriate, HetG; microvessels in nested arrangement

ring: 	early wood and late wood very good distinct in rings	X

vessel types and arrangements: 	macrovessels in early wood (predominantly solitary), microvessels in late wood (arrangement)	X

microvessels arrangement: 	nested	X

type of vessel perforation: 	simple	R

tyloses: 	frequent in early wood vessels	X, R, T

vessel thickenings: 	fine spiral by late wood vessels	R, T

rays: 	heterogeneous	R, T

width of rays	1–9	T, (X)

apotracheal parenchyma: 	marginal	X

paratracheal parenchyma: 	scanty, (confluent)	X

tracheids in basic tissue: 	vascular an vasicentric	R, T

other: 	crystals in parenchymatic cells

Wood properties

density: 	moderate heavy to heavy

ρ 0: 	600 až 720 kg/m3

ρ 12-15: 	630 až 760 kg/m3

ρ green: 	kg/m3

shrinkage: 	medium

- volumetric (βV): 	%

- radial (βR): 	%

- tangential (βT): 	%

mechanical properties: 	strong, elastic

ultimate strength in compression ||: 	MPa

ultimate strength in bending: 	MPa

ultimate strength in tension ||: 	MPa

hardness: 	moderate hard to hard

Janka's hardness: 	MPa

technological properties: 	no problem with working and finishing; it's necessary slowly drying

resistance: 	rated as resistant to decay

Wood utilization

small practice application; veneers, furniture, turning work and poles

References