Some species are named after siphons because they resemble siphons in whole or in part.  Geosiphons are fungi.  There  are species of alga belonging to the family Siphonocladaceae in the phylum Chlorophyta which have tube-like structures. Ruellia villosa is a tropical plant in the family Acanthaceae that is also known by the botanical synonym, Siphonacanthus villosus Nees.