Table 1.
Comparison of morphological and some ultarstructural characters of new and known genera of Streptophyta which characterized by similar morphology.1
| Character | Klebsormidium | Interfilum | Hormidiella | Entransia | Streptosarcina | Chlorokybus | Streptofilum |
|---|---|---|---|---|---|---|---|
| Thallus morphology | Filaments or short filaments disintegrating to unicells | Filaments surrounding by mucilage, easily disintegrating to unicells, or packets | Filaments with a stalk (or without it in culture conditions) | Filaments | Packets or branched filaments | Packets surrounding by strong mucilage envelope | Filaments surrounding by mucilage, easily disintegrating to unicells |
| Chloroplast morphology | Plate shaped, with smooth margin or with marginal dissections | Plate shaped, waved or dissected on several lobes | Plate shaped, with smooth margin | Plate shaped, deeply dissected on several long finger-like lobes | Plate shaped, waved or dissected on several lobes | Plate shaped with smooth margin | Plate shaped, with smooth margin |
| Pyrenoid morphology | Single, surrounded by several/many small starch grains | Single, surrounded by several starch grains | Single, surrounded by several starch grains | Several, surrounded by many small starch grains | Single or several in old stage, surrounded by many small starch grains | Single, surrounded by many small starch grains, presence of pseudopyrenoid (discrepancy of chloroplast lamellae) | Single, surrounded by several starch grains |
| Pyrenoid ultrastructure | Pyrenoid matrix traversed by several/many parallel thylakoids | Pyrenoid matrix traversed by several parallel thylakoids | Pyrenoid matrix homogenous | Pyrenoid matrix traversed by many parallel thylakoids | Pyrenoid matrix traversed by several parallel thylakoids | Pyrenoid matrix traversed by many parallel thylakoids | Pyrenoid matrix homogenous |
| Cell coverage | Cell wall, thin mucilage envelope in some species | Cell wall with mucilage envelope striated structure | Cell wall | Cell wall | Cell wall | Cell wall, strong mucilage envelope | Layers of piliform scales submerged in the mucilage with homogenous structure and waved margin |
| Cell wall/coverage remnants | H-like and cap-like (rarely) fragments | Cap-like fragments | H-like fragments, rarely | H-like fragments | H-like fragments | Cap-like fragments | Cap-like fragments |
| Cell division | Mostly in one plane (sporulation-like type) | In one/several planes (sporulation-like type) | In one plane (sporulation-like type) | In one plane (perhaps sporulation-like type) | In several planes (sporulation-like type) | In several planes (sporulation-like type) | In one plane (sporulation-like type) |
| Asexual reproduction | Zoospores, aplanospores | – | Zoospores, aplanospores | Zoospores, aplanospores | Zoospores, aplanospores | Zoospores, aplanospores | – |
| Sporangium morphology | One zoospore per sporangium, realized through opening in cell wall | – | One zoospore per sporangium, realized through opening in cell wall, sporangium with rounded protrusion | Zoospores realized through opening in cell wall | One zoospore per sporangium, realized through opening in cell wall, sporangium with rounded protrusion | One zoospore per sporangium, realized through opening in cell wall | – |
| Zoospores morphology | Wall- and stigma-less, with two equal subapical flagella | – | Wall- and stigma-less, with two equal or unequal (doubtful) subapical flagella | – | Wall- and stigma-less, with two equal subapical flagella | Wall-less (covered by submicroscopic scales) and stigma-less, with two equal subapical flagella | – |
| Zoospores germination | Ellipsoid cell with mucilage disc | – | Ellipsoid cell with stalk and holdfast | Ellipsoid cell with apical spine and mucilage adhesive | Spherical cell | Spherical cell | – |
| Young thallus originated from zoospore | Heteropolar filament with mucilage disc | – | Heteropolar filament with stalk | Heteropolar filament with mucilage adhesive and apical spine | Homopolar, sarcinoid packet | Homopolar, sarcinoid packet | – |
| Sexual reproduction | Isogamy, doubtful | – | Heterogamy, doubtful | – | – | – | – |
| Big single peroxisome | Present | Present | Present | Perhaps absent | Present | Present | Present |
| Ecology | Terrestrial and aquatic | Terrestrial | Terrestrial or amphibian | Aquatic (typical for peat bogs) | Terrestrial | Terrestrial | Terrestrial |
| Number of described species | About 20 | 3 | 3 | 2 | 2 | 1 | 1 |
1
Characters of known genera were provided on the base of following works: Lokhorst 1996; Mikhailyuk et al. 2008, 2014; Lokhorst et al. 1988, 2000; Cook 2004; Ettl and Gärtner 2014.