R. Brown
Chlor. Melvill., 41. 1823.
Etymology: Greek haplo- , single, and odon, tooth, alluding to single layer of peristome teeth
Synonyms: Haplodon R. Brown ex I. Hagen
Treatment appears in FNA Volume 28. Treatment on page 28. Mentioned on page 15, 650.

Plants in slender lax tufts, light green distally. Stems 6 cm; rhizoids dense proximally. Stem leaves broadly ovate or obovate; margins entire; apex obtuse to acute and abruptly short-acuminate; costa ending before apex; proximal laminal cells rounded-rectangular; distal cells oblong-hexagonal. Sexual condition autoicous. Seta 1–2 cm, twisted, flexuose. Capsule not cleistocarpous, reddish, black with age, shrunken and widest at mouth when dry, ovate when moist; hypophysis same color as urn, rounded, elongate, not or slightly wider than urn; annulus weakly differentiated; operculum hemispheric, sometimes apiculate; peristome single; exostome teeth 8–12, at first in pairs, then separate, erect or reflexed, rudimentary. Calyptra mitrate or cucullate, conic, not constricted beyond base. Spores 10–15 µm, smooth.


n North America, n Eurasia, subarctic to Arctic regions.


Species 1.

Although plants of Aplodon have an inflated hypophysis, based upon the molecular data, placement of the genus is not well resolved within Splachnaceae, and its relationship to or within this family requires further study (B. Goffinet et. al. 2004).

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