A taxonomic monograph of the genus Acrolejeunea (Hepaticae) with an arrangement of the genera of Ptychanthoideae ; (studies on Lejeuneaceae subfam. Ptychanthoideae III) - Gradstein, Stephan Robbert 1943- (Cramer, 1975)
Zugl.: Utrecht, Univ., Diss., 1975