Atrichum angustatum (Polytrichaceae) had not been recorded in Belgium for more than a century, until it was rediscovered in 2014. In this article, we disclose the coordinates of that find, and add two new observations from the same area (Zedelgem-Oostkamp). We also report on a validation of the species’ identity by means of DNA barcoding. This genetic test clearly confirmed the latest sample as A. angustatum. Given the extremely scarce observations, and taking into account the inherent risks associated with its dioecious life-history, the current status as a red-listed species remains justified.