Saccomorpha collaris Radtke, Hook, Campbell et Golubić, 2024

Key feature (diagnosis): The largest cavities have a “neck” with a collar (Figs. 3d,e; 4a), suggesting a feature of maturity, however a few smaller cavities show collared necks suggesting an occurrence of the collar feature early in its process of development (Fig. 3g). The largest cavities of S. collaris are 40 x 30 x 20 μm. In S. clava they are smaller. Like S. clava, most of the sporangial cavities in the process of development lack collars (Fig. 3a,b).