Physochila griseola (Penard, 1911) Jung, 1942

Diagnosis: Shell pyriform or ovoid, slightly compressed, composed mainly of oval or polygonal plates. Aperture circular, with a strongly outward‑curved collar.

Ecology: Occurs in Sphagnum swamps and mosses. I found numerous shells in samples from a peat bog along the Bert Bos path in Loosdrecht, in the central Netherlands (September 2012). Additional material originates from Tirol, Austria, and southern Sweden, both from Sphagnum samples.

Dimensions: Shell length 70–85 µm, mean 75 µm (Deflandre, 1926). My measurements: 78–86 µm.

Remarks: In the picture below, the collar appears to curve inward rather than outward.