Antheridia most often on a short branch, globose-oblong or cylindric.
They are of cylindric form, crimson in colour, and each stamen bears from two to six anther-cells.
Capillitium not much expanded after dehiscence, cylindric, pale cinereous, or pale yellowish; the threads variable in thickness.
Mass of capillitium and spores bright yellow; elaters simple, rarely branched, cylindric, 3.5–4 mic.
Mass of capillitium and spores yellow; elaters long, simple, cylindric, 3–4 mic.
Cylindric elongated; whitish, with two yellowish bands, and transverse elevated stri; spire thick, obtuse.
Antenn short, cylindric, gradually thickening to their tip, which is naked and abruptly truncate.
Now let us consider a cylindric film contained between two equal fixed disks.
Hence if the length of the cylindric film is less than its circumference, it is in stable equilibrium.
Hence the equilibrium of a cylindric film whose length is greater than its circumference is unstable.