Micrasterias truncata Ralfs
Reference: Ralfs 1848
Synonym: Micrasterias crenata Ralfs
Remarks: The extent to which the incisions are open or closed is very variable in this species and is probably determined by environmental circumstances. Specimen 2018035-010 (left photo) which is described in the literature as var. bahusiensis Wittrock was created by the microscopic slide drying out. After the slide was moistened, the cell returned to its normal shape (right photo). Forms in which both semicells are reduced are common.

Europe


C0333
2013011006
C0333
2005012003
2013011-006
Front view
Netherlands
2005012-003
Front view
Netherlands
C0333
2012026018
C0333
2014047017
2012026-018
Front view
Netherlands
2014047-017
Front view
Austria

North America


C0333
2016041001
2016041-001
Front view
USA (WA)
Sample Robin Matthews

Aberrant form bahusiensis


C0333
2018035010
C0333
2018035010
2018035-010
Front view
Austria
2018035-010
Front view
Austria

Forms with reduced cells


C0333
2018032001
C0333
2018010001
2018032-001
Front view
Austria
2018010-001
Front view
Netherlands
All photos copyright: © 2009-2022 Alfred van Geest - Send comments to asvg@xs4all.nl