Thin, crinkly, translucent fronds. Like a sheet of red cellophane or discarded wrapping paper. Pyropia columbina is the delicate one. It is a single cell thick in places. So fragile that you can tear it with your fingers. It clings to rocks in small patches. Its edges flutter in the current. It looks like it should be torn to pieces by the first wave. But despite that delicate appearance, this is a survivor of the intertidal zone. It can withstand hours of exposure to sun and air at low tide. Its fronds dry to a crisp. When the tide returns, it rehydrates within minutes. Turning soft and pliable again. A resurrection plant of the sea. Able to survive the daily cycle of drowning and drying. The colour is not exactly red. More reddish-purple. Sometimes brownish. Depending on light and season. The pigment phycoerythrin captures blue-green light that penetrates deepest into the water. Allowing red sea lettuce to grow at depths where green seaweeds cannot survive. The life cycle is complex. The leafy stage produces spores that bore into the shells of mussels and barnacles. Growing into a network of filaments. Those filaments produce another type of spore. Which grows into the leafy stage. A two-step dance that has worked for millions of years. Red sea lettuce is the New Zealand relative of nori. The seaweed used to wrap sushi. It is rich in vitamins and minerals. With a salty, slightly sweet flavour. Eaten fresh, dried, or cooked. It was a traditional food of coastal Māori. Harvested from rocks and dried for winter. To find a patch at low tide is to find a flash of colour on dark rock. Thin, crinkly fronds flutter in the wind. Red edges catching light. It looks delicate. Fragile. Almost insubstantial. But it can dry to a crisp and come back to life with the next tide. The delicate one. The thin one. The one that refuses to be torn apart. Not Threatened. Common on rocky shores throughout New Zealand. Particularly in exposed and semi-exposed locations in the upper intertidal zone.