PlantaeDB Logo
Login Sign-up

Genus Folioceros in Family Anthocerotaceae

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).

Do you wish to read more about plant taxonomy? Click here!

Genus Description

Suggest a correction!

Folioceros (Anthocerotaceae, Anthocerotales) comprises a small genus of hornworts with about 22 species (R. G. Gradstein, 2021). It is widespread in South and Southeast Asia from the Himalaya through China, Japan, Malesia, and into the Pacific, with occasional records in the Americas, and occurs from lowland to alpine elevations in moist microhabitats such as soil banks, shaded rock crevices, and streambanks. The type species is Folioceros fuciformis (Mont.) D.C.Bhardwaj (S.R. Gradstein et al., 2022).

Plants are thallose with a conspicuous central dorsal sulcus and typically an unbranched to weakly lobed thallus; the ventral surface bears a dense mat of mucilage hairs. The capsule is elongate-cylindrical, dehiscing along two lines to expose a columella, and is subtended by a protective perichaetial involucre that is usually funnel-shaped. Spores are usually brown to dark and reticulate-foveolate, contrasting with the sometimes paler and more densely papillose spores of related genera. The gametangia are embedded in tissue chambers, and the sporophyte possesses a basal intercalary meristem typical of hornworts (Hässel de Menéndez, 1988; R. G. Gradstein, 2021).

Diversity peaks in Asia, with numerous regional endemics; many species are narrow-distributed, occuring on soil over rocks or in wet gullies, and some extend into cloud forests at higher elevations. Recent regional treatments recognize the genus as a distinct lineage, while global synthesis often retains Folioceros as a subgenus within Phaeoceros; alternative treatments (e.g., Notothylas and Megaceros) are also applied to certain taxa in some works (S.R. Gradstein et al., 2022; WHO, 2024). Pollination is non-existent in the sexual phase, with spores dispersed by wind and water; life-history features are typical hornwort biology (R. G. Gradstein, 2021). A base chromosome number of x=6 is well supported for Phaeoceros sensu lato and by extension for Folioceros (Hässel de Menéndez, 1988).

The genus has no major economic uses; it occurs in research, education, and ecological studies, and several species are used as bioindicators of clean, shaded, and humid microsites. Threats include habitat loss, hydrological disturbance, and climate-driven drying of microhabitats; data for many taxa remain sparse (POWO, 2024). Improved field surveys and molecular phylogenetics across Asia are needed to refine species limits and conservation priorities.

Pick a Species to see its components: