The filaments can gelatinize by absorbing water and are thought to function in helping the ascomata adhere to the surface on which they grow, like the underside of leaves. In P. guttata, the foots are cylindrical, irregular in width, 32–72 by 7.5–25 μm, and divided into 2–10 branchlets in the upper part.
Filaments can become flexible when they absorb moisture and are believed to aid in the ascomata's attachment to surfaces, comparable to the underside of leaves. In P. guttata, the feet are cylindrical, with irregular widths, measuring 32–72 by 7.5–25 μm, and branching into 2–10 segments in the upper portion.