Colony gelatinous, up to 3 cm in diameter, olive green to yellow-green, irregularly spherical, with hollow center and radially oriented filaments with fine, diffuse, colorless to yellowish sheaths. Trichomes uniseriate, with isodiametric barrelshaped cells, or elongated (up to three times as long as wide cells) blue-green cells, 2.8-5 µm wide, 5-15 µm long. True lateral branching with long cylindrical multicelled branches, or a few-celled short branches terminated by apical heterocysts. Heterocysts intercalary (bipored), and terminal (single pored), 5.3-6 µm wide, 5.4-8 µm long.