Stylonema

{{Short description|Genus of algae}}

{{Automatic taxobox

| image = Stylonemaalsidii.jpg

| taxon = Stylonema

| authority = Reinsch 1875Reinsch, P.F. (1875 '1874/75'). Contributiones ad algologiam et fungologiam. Vol. 1. Norimbergae: Typis Theodor Haesslein

| subdivision_ranks = Species

| subdivision =

• Stylonema alsidii
• Stylonema cornu-cervi (type)
• Stylonema subcoeruleum

}}

Stylonema is a genus of red algae, common in Australian waters. It is distinguishable from other species of red algae by the width of the filaments of its thallus, being only one cell across.

It includes the species Stylonema alsidii.{{cite book|author=John Marinus Huisman|title=Marine plants of Australia|url=https://books.google.com/books?id=xPqjXtxk0z8C&pg=PA26|accessdate=9 September 2020|year=2000|publisher=UWA Publishing|isbn=978-1-876268-33-6|pages=26–}}