Over een kommervorm van Staurastrum furcatum

In June 2022, among Sphagnum cushions in a Drenthian moorland a remarkable Staurastrum cell was found that could not be identified with current European floras. It seemed to be identical to Staurastrum monticulosum var. irenee-marie Graffius described from Noth America and dealt with in Prescott et al. (1982, p. 256, pl. 378: 6). However, closer examination of the sample in question learned that the form was to be connected with quite a series of anomalous forms of Staurastrum furcatum (Ralfs) Bréb. This case illustrates the ease with which anomalous cell forms can lead to misidentifications.