*Trentepohlia odorata* (F.H. Wiggers) Wittrock 1880

Description: The alga formed a dense mat over tree bark (Figure 1A,B). The thallus mainly consisted of abundant erect parts and poorly prostrate filaments. Most of the erect filaments were nearly parallel, consisting of 3–10 cells, rarely branched and with a tapering end (Figure 1C). Apical vegetative cells of erect filaments were substantially longer than basal vegetative cells (Figure 1C,D). Cells of erect filaments were approximately 7–16 μm in width and 14–21 μm in length, with a length/width ratio of about 1.1–1.9. Prostrate filaments were often branched and form compact patches, the cells of which were mostly globose to ellipsoid or with other irregular shapes (Figure 1D,E). The size of the vegetative cells was approximately 8–13 μm in width and 12–18 μm in length, with a length/width ratio about 1.0–1.5. Presumptive zoosporangia were apical, intercalary, or lateral and mainly produced on erected filaments that are globose, ellipsoid, and obovate (Figure 1C–E). Most intercalary zoosporangia were globes and smaller than apical and lateral ones. The lateral zoosporangia were often clustered and are mainly obovate with an obvious dorsal pore (Figure 1E). The intercalary zoosporangia were

approximately 8–12 μm in width and 9–16 μm in length. The lateral and apical zoosporangia were approximately 10–24 μm in width and 18–28 μm in length.

**Figure 1.** Morphology of *Trentepohlia odorata*. (**A**,**B**), steroscopic view of *Trentepohlia odorata* specimen (preserved in Formol acetic alcohol solution) on surface of *Fagus longipetiolata*. (**C**), microscopic view of heterotrichous thallus and its intercalary zoosporangium (arrow). (**D**), the apical zoosporangium with a dorsal pore (arrow). (**E**), the lateral zoosporangia with dorsal pore in cluster (arrows) at the basal part of thallus. Scale bars, 1 mm in (**A**), 200 μm in (**B**), 30 μm in (**C**–**E**).

This specimen was collected from a tropical botanical garden and formed abundant red growth on the surface of *Fagus longipetiolata* trunk. The morphology of specimen DZ1317 was completely consistent with primary description by Wittrock (1880) and Printz (1939) [7,10]. Despite being unable to observe the holotype of *Trentepohlia odorata* from its type locality (Fiona, Denmark), there is little morphological difference between our specimen and the holotype according to its primary description.
