Abstract
AbstractA small, endemic leafy liverwort found in the coastal redwood forests of Santa Cruz and Monterey Counties of California is described as a new species of Mesoptychia (Lindb.) A. Evans, i.e., Mesoptychia polymorpha Stotler, Crand.-Stotl. & Bakalin, sp. nov. This new taxon is morphologically related to the suite of small-leafed species of the genus, including M. badensis (Gottsche ex Rabenh.) L. Söderstr. & Váňa and M. morrisoncola (Horik.) L. Söderstr. & Váňa, but is unique within the genus in having mature vegetative leaves and bracts that are undivided and apically rounded to emarginate, with bilobed to retuse leaves of restricted occurrence. Although this polymorphic species is paroicous, perianths expand without fertilization and sporophytes are unknown.
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