 The paraphyses (sterile cells interspersed among the asci) are 8–9 µm long and have internal partitions called septa.The structure of the septa has been investigated using transmission electron microscopy, which has revealed that "W. americana" has a single pore plugged by a "fan-shaped matrix"—an electron-dense region with a torus-shaped ring of translucent tissue wrapped around it.The pore plug resembles those found in the Sarcoscyphaceae species "Sarcoscypha occidentalis" and "Phillipsia domingensis".