1. Longitudinal view
1.1 angular - with angled lines/edges along the length of the fibre
1.2 convoluted - exhibiting folds and twists along the length of the fibre
1.3 cylindrical
1.4 flattened
1.5 nodular thickenings - local thickening across the width occurring at intervals along the length
1.6 smooth
1.7 striated - striped or streaked
1.8 triangular - as angular

2. Surface / pattern
2.1 cracks with sharp edges
2.2 criss-cross - diagonal marks/lines on the surface
2.3 diagonal lacerations - diagonal cuts
2.4 diamond/rhomboid
2.5 fuzzy - with a frizzy, not well defined texture
2.6 local swelling
2.7 longitudinal lacerations with rugged edges - cuts with uneven edges
2.8 longitudinal striations - striped or streaked
2.9 moiré - marbled effect, layers of superimposed sets of lines
2.10 no pattern
2.11 polylobe formations - having many lobes (roundish, protruding parts)
2.12 pronounced convolutions
2.13 ragged/wavy - irregular and uneven surface
2.14 ridged - surface with raised lines along the length of the fibre
2.15 scales
2.16 splitting
2.17 staggered- like brickwork
2.18 stringy/ropy - fibrous appearance along the length of the fibre

3. Cross-section
3.1 bean-shaped
3.2 curved
3.3 curvilinear - consisting of curved lines of no particular shape
3.4 oval
3.5 parallelogram
3.6 polygonal - with many angles
3.7 polylobe
3.8 rectangular
3.9 round
3.10 sharp triangular
3.11 triangular

4. Inner structure
4.1 compact
4.2 long medulla/lumen
4.3 narrow medulla/lumen
4.4 porous
4.5 structured medulla/lumen
4.6 thick cell walls
4.7 thin cell walls
4.8 void medulla
4.9 wide medulla/lumen

5. Measurements
5.0 ≥200 μm
5.1 ≥100 μm
5.2 70-100 μm
5.3 50-70 μm
5.4 35-50 μm
5.5 20-35 μm
5.6 15-20 μm
5.7 10-15 μm
5.8 5-10 μm
5.9 0-5 μm