Fig. 2

Morphological character of the specimens (SXU-YN24005 and SXU-YN24006) in this study. A Specimens collected the stone wall of the Washing Vegetable Pool in Kunming City, Yunnan Province, China; B Morphology of whole thallus of chantransia specimen (left) and gametophyte specimen (right), olive-green in both stages; C the habit of gametophyte thallus; D Main axis with confluent whorls containing spherical and unstalked carposporophytes (long arrow), one per whorl; E Cortical filament cells (long arrow); F Cortical filament cells (long arrow) and secondary fascicles abundant, dichotomously or trichotomously branched, covering the entire internode; G gonimoblast filaments with carposporangia (white long arrow); H Mature carpogonium with pedicellate trichogyne (arrow) and carpogonial branches helically twisted, arising from pericentral cells (long arrow); I Fertilized carpogonium with clavate trichogyne (arrow) and attached spermatatangia (long arrow); J Micromorphology of prostrate filament; K Monosporangia small and abundant, ovoid or sub-spherical in shape (long arrow) and Vegetative cylindrical, fascicles branch angles ≤ 25°(arrow); L Monosporangia branch with ovoid or sub-spherical monosporangia (long arrow); M Vegetative cylindrical, fascicles branch angles ≤ 25°(arrow); N–O Cells have irregular lobed chromatoplast (white long arrow)