Plants elliptic to globose, ca. 2 mm. Stem leaves cuspidate, broadly channeled; laminal cells smooth. Seta short, about 0.3 the diameter of the capsule. Spores spheric to elliptic, 30–50 µm, papillose or nearly smooth.

Distribution

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Temperate areas of the Northern Hemisphere, Africa.

Discussion

Varieties 2 (2 in the flora).

As H. A. Crum (1969) and A. J. Grout (1939) pointed out, American specimens reported as Acaulon rubrum are A. muticum var. rufescens. These plants are often small, rather three-sided and may be confused with A. triquetrum. The leaves of both varieties stain red, at least in blotches, in KOH, and they intergrade to some extent.

Selected References

None.

Lower Taxa

Acaulon muticum var. muticum, Acaulon muticum var. rufescens

Key

1	Plants yellow-brown in nature, spores papillose- punctulose	Acaulon muticum var. muticum
1	Plants yellow- to red-brown in nature, spores smooth or papillose-punctulate	Acaulon muticum var. rufescens