This species forms brownish to purplish red tufts up to 4 (10) cm tall (Image A). Near the tips the axes are ecorticate and typically appear regularly alternately branched (Image B), the main axes with a weak sinusoidal pattern and rectangular cells 30-48 µm wide by 36-70 µm tall (Image C). However, careful observation below the tip reveals a branching pattern that transitions to spiral in habit (Image D), which can be observed mid thallus where the axial cells remain ecorticate and are 80-94 µm wide by 455-490 µm tall (Image E). Low on the axes branching can appear irregularly alternate to spiralled (Image F), the axial cells 80-90 µm wide by 124-140 µm tall (Image G) with a thin and loose covering of rhizoidal filaments (Image H). Tetrasporangia develop adaxially with lagging abaxial production on the upper filaments (Image I), these 50-56 µm wide by 58-69 µm tall, sessile and with tetrahedral division (Image J).
Image A. Press of our only specimen from subtidal (12 m) on wood, English Harbour East Government Dock, NL (GWS007477; line is 2 cm).
Image B. Axis near the tip appearing regularly alternately branched (GWS007477; rehydrated from press).
Image C. Close up of main axis and branching pattern near the tip (GWS007477; rehydrated from press).
Image D. Branching has a spiral pattern (arrows) moving from the tip (GWS007477; rehydrated from press).
Image E. Branching has a spiral pattern (arrows) lower mid thallus (GWS007477; rehydrated from press).
Image F. Lower axes are relatively robust with irregularly alternate to spiral branching (GWS007477; rehydrated from press).
Image G. Close up view of lower axial vegetative cells (GWS007477; rehydrated from press).
Image H. Close up of rhizoidal cortication around the main axis (GWS007477; rehydrated from press).
Image I. Adaxial tetrasporangial production proceeds abaxial development on upper filaments (GWS007477; rehydrated from press).