Phaeosaccion

{{Short description|Genus of algae}}

{{Speciesbox

| image =

| grandparent_authority =

| genus = Phaeosaccion

| parent_authority = Farlow 1882

| species = collinsii

| authority = Farlow 1882

}}

Phaeosaccion is a genus of algae with monostromatic tubular to saccate thalli, up to {{convert|20|cm|in}} long and to {{convert|2|cm|in}} wide. It is the sole genus in the family Phaeosaccionaceae. It is olive brown and resembles young plants of Scytosiphon.[http://www.algaebase.org/search/genus/detail/?genus_id=A66db2bc5636ae7ab Phaeosaccion, AlgaeBase] The sole species in the genus is Phaeosaccion collinsii, a species of marine algae.[http://www.algaebase.org/search/species/detail/?species_id=52959 Phaesaccion collinsii, AlgaeBase] It was first identified in a publication by W.G. Farlow in the article Notes on New England algae published in Bulletin of the Torrey Botanical Club in 1882. It was named in honor of Frank Shipley Collins.Makers of American Botany, Harry Baker Humphrey, Ronald Press Company, Library of Congress Card Number 61-18435{{rp|56}} Phaeosacchion collinsii is red listed in Iceland as a vulnerable species (VU).Náttúrufræðistofnun Íslands [Icelandic Institute of Natural History] (1996). [http://utgafa.ni.is/valistar/valisti_1.pdf Válisti 1: Plöntur.] (in Icelandic) Reykjavík: Náttúrufræðistofnun Íslands.