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Genus Plicanthus in Family Anastrophyllaceae

In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.

Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.

Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).

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Genus Description

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Plicanthus (R.M.Schust.) is a small genus of leafy liverworts placed in the family Lepicoleaceae. It comprises approximately six species that occupy cool, humid forests and subalpine scrub in southern South America and the Australasian region (Söderström et al., 2016; World Flora Online, 2024). The generic name was introduced by Schuster (1966), who designated the type species Plicanthus sp., an epithet subsequently applied to the majority of recognized taxa (R.M. Schuster, 1966). The genus therefore serves as a nominal reference for the group and is linked to the original circumscription by its author.

Morphologically, Plicanthus shares the typical leafy liverwort habit, with incubously attached leaves that are usually bilobed and bear a narrow dorsal wing. Underleaves are bifid to quadri‑lobed and often possess ciliate margins. The perianth is campanulate and strongly plicate, a character that distinguishes Plicanthus from the closely related Lepicolea. Reproductive structures are borne on short lateral branches and the spores are small, smooth‑walled, reflecting the family’s general pattern (Grolle & Long, 2002).

Centers of diversity lie in New Zealand and Tasmania, where several endemics occur (GBIF, 2023). Species typically grow on acidic substrates such as decaying logs and shaded rock faces at elevations from 300 to 1500 m, preferring moist, nutrient‑poor habitats. Biogeographically, the genus exhibits a classic Gondwanan distribution, with disjunct populations in the Patagonian Andes reflecting post‑Cretaceous dispersal across the southern hemisphere (Grolle & Long, 2002).

Sexual reproduction follows the typical liverwort pattern, requiring free water for sperm transfer; spores are wind‑dispersed and can germinate rapidly on moist substrata. Asexual propagation by fragmentation of the delicate fronds is common, especially in disturbed habitats.

Within Plicanthus no formal subgeneric or sectional taxa are currently recognized. Molecular data consistently place the genus as sister to Lepicolea in a monophyletic Lepicoleaceae clade (Söderström et al., 2016). Historical synonymizations have occasionally merged Plicanthus into Lepicolea (Grolle & Long, 2002), but the recent consensus favors generic separation, a view reflected in the World Flora Online (2024) and GBIF taxonomic backbone. Some taxonomic instability persists for species delimitation in New Zealand, where morphologically similar populations may represent cryptic taxa (GBIF, 2023).

The genus has limited economic importance; a few species occasionally appear in specialized horticultural collections of temperate bryophytes, prized for their delicate, plicate perianths. No species are used for timber, crops, or as invasives, reflecting their narrow ecological niche.

Habitat loss through logging and climate‑induced drying threatens several endemic populations, and ongoing taxonomic clarification is needed to inform conservation assessments (Söderström et al., 2016).

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