Byssus flos-aquae Linnaeus, Species Plantarum 2: 1168. 1753.

"Habitat in Mari & omni aqua, prima aestate; nocte descendit parum, die natat fere." RCN: 8397.

Neotype (Pentecost in Spencer & al. in Taxon, in press): Rabenhorst, Algen Europas No. 1463, " Sphaerozyga flos aquae (Linn.)" (BM-000769430).

Current name: Aphanizomenon flos-aquae (L.) Ralfs ex Bornet & Flahault ( Nostocaceae).

Note: Although Drouet & Dailey (in Butler Univ. Bot. Stud. 12: 145. 1956) attempted to typify the name using 1278.1 (LINN), this collection is annotated only by Linnaeus filius and is evidently a post-1753 addition to the herbarium and not original material for the name. For this reason, Ross & Irvine (in Taxon 16: 184. 1967) rejected this type choice.