Ptychomitrium acutifolium Hook. f. et Wils. (Ptychomitriaceae, Musci), a distinct species endemic to Australia

Ptychomitrium acutifolium Hook. f. et Wils., which was synonymized in P. australe by Catcheside in 1980, proved to be a distinct species endemic to Australia. The differences between P. acutifolium and P. australe are detailed.