They are sometimes rolled into a funnel shape. The top section is a funnel shape container. The calyx curves inward in a funnel shape. The lips are wrinkled up and modified into a funnel shape. The flowers are small with a pale green colour and a funnel shape. The epithet, " infundibula", is in reference to the funnel shape of the thallus branches. The many flowers of the plant are large and tubular, opening into a funnel shape. The entrance is often extended with webbing, sometimes resembling a funnel shape. Their overlapping bases and curve give the flower a distinctive funnel shape. In addition, its funnel shape makes it possible to effectively capture plankton of various sizes.