![Sample our Environment & Agriculture journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5934/TOC-Subject-Sample-2021-Environment-Agriculture.jpg"})
Abstract
The typification of Pleurosigma obscurum W. Smith is discussed with reference to material collected by W. Smith. The placing of the species in the genus Gyrosigma in recent publications is incorrect. All intact cells of this organism were collected in non-marine samples. Claims in the literature for a marine-brackish ecology of this organism may be due to the fact that marine-brackish environments harbour several species that cannot be separated from P. obscurum using traditional species criteria.
