Jania pedunculata (Rhodophyta: Corallinaceae): Typification, nomenclature, and taxonomic status relative to J. crassa, J. verrucosa sensu Johansen & Womersley, and J. ungulata

New nomenclatural and morphological-anatomical data support the following conclusions: (1) Jania pedunculata (Rhodophyta: Corallinaceae) is a name underpinned by a newly designated lectotype and epitype whose features are consistent with placement in the genus Jania; (2) J. pedunculata and J. crassa should not be treated as heterotypic synonyms; and (3) Australian specimens previously referred to J. verrucosa, a name of uncertain application, belong to J. crassa and not to J. pedunculata. Detailed accounts of the lectotype and epitype of J. pedunculata are provided, relevant historical background data are summarized, and possible affinities with the later described J. ungulata and J. ungulata f. brevior are considered.