Five species of Ptychomitrium have been recognised in Australia: P. acutifolium, P. australe, P. laxifolium, P. mittenii and P. muelleri. Apart from P. mittenii these species have been confused in the literature and in herbarium identifications. Here P. acutifolium, P. australe and P. mittenii are accepted as good species. P. laxifolium is synonymised under P. acutifolium, and P. muelleri is synonymised under P. australe.
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