Post considered Dictyota adnata Zanardini to be a synonym of D. viella
rdii Kutz. However, examination of the type specimen of D. vieillardii
proves it does not belong to the genus Dictyota but represents the Va
ughaniella stage of a Padina species. D. vieillardii var, filiformis K
utz. is also shown to represent a Vaughaniella stage. The type specime
n of D. adnata could not be traced and the designation of a neotype by
Coppejans is confirmed.