This fern looks like it expects trouble. The fronds are dark green, leathery, and divided into dozens of sharp-pointed leaflets. Each leaflet is edged with spines. These are tiny, stiff, bristly teeth. They catch your fingers if you try to touch them. The stem is covered in scales and more bristles. The whole plant has an attitude. It says do not mess with me. The message is clear. It is not an invitation. The armour makes it special. Polystichum vestitum means covered in bristles. The name is accurate. The fronds are tough and spiky. They are designed to deter anything that might want to eat them. Possums think twice. Deer take a bite and move on. Even insects struggle to chew through the leathery, bristly tissue. The defence is effective. It works. The plant survives because it is difficult to consume. The fronds are once-divided. Each leaflet is shaped like a small shield. Hence the name shield fern. They are arranged in a dense rosette. This forms a crown that can be half a metre across. The fertile fronds are similar to the sterile ones. They are taller. They bear the sporangia on the undersides of the leaflets. The structure is consistent. It does not vary much. The symmetry is striking. It holds its ground. The bristly shield fern is not a pioneer. It does not colonise bare hillsides. It prefers established forest. It likes stable shade and damp soil. Once established, it is persistent. Its creeping rhizome spreads slowly through the leaf litter. It sends up new fronds at intervals. Over time, a single plant can form a small colony. The spread is slow. It claims space by endurance. Reproduction occurs by spores, like all ferns. The fertile fronds produce spores in clusters on the undersides of the leaflets. These are protected by a round, shield-shaped covering called the indusium. This gives the genus its name. Polystichum means many rows. It is a tough fern. It tolerates deep shade. It handles poor soil. It survives moderate drought. It is not a diva. It does not need pampering. It just needs a bit of damp soil and a bit of patience. The requirements are modest. In a world of soft, drooping ferns and delicate, lacy fronds, the bristly shield fern is the one that came prepared. It is the fern with the armour. It has the spikes. It has the attitude. It looks defensive because it is defensive. The forest is a dangerous place. This fern has been here long enough to know it. It adapts to the threat. It does not hide. It fortifies. Do not touch it. You will regret it. But admire it from a distance. Look at the dark green crown of spiky fronds. See them bristling with spines. It quietly holds its ground in the damp understorey. It is not afraid. It is not impressed. It is just well armed. The strategy is simple. Survive by being difficult. No one told it otherwise.