Nomenclatural problems in the liverwort Petalophyllum are addressed. Following a review of the original description of the genus, it is concluded that Petalophyllum Nees & Gottsche ex Lehm. or simply Petalophyllum Lehm. is the correct citation for the genus. The correct citations for the two species intially placed in the genus are P. preissii Lehm. and P. ralfsii (Wilson) Nees & Gottsche ex Lehm. and a designation of P. preissii as the type species for the genus is accepted. Lectotypes are designated for P. preissii, P. ralfsii, P. bolivianum Steph., P. indicum Kashyap, and Fossombronia corbulaeformis Trab. and a neotype is designated for P. lamellatum (Nees) Lindb. Petalophyllum australe Colenso and P. macrocalyx Colenso have been proposed for rejection since there are no extant specimens of these taxa and their protologues are beset with interpretive problems.
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Vol. 105 • No. 3