BFNA Title: Prasanthus
Author: W. S. Hong
Date: February 14, 2002
Edit Level: R Brum+
Version: 1

Bryophyte Flora of North America, Provisional Publication
Buffalo Museum of Science
1020 Humboldt Parkway
Buffalo, NY 14211 USA


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Gymnomitriaceae - Prasanthus

xxx. PRASANTHUS Lindberg in Kgl. Sv. Vetensk. Akad. Handl. 23 (5): 62. 1989 Greek prason, onion, plus anthos, flower

Won Shic Hong

             Plants ca. 0.5 mm wide, forming dense prostrate mats. Stem a subterranean rhizome, ca. 5--10 mm, with numerous rhizoids. Leaves transversely inserted, scalelike, elliptical; cell walls thick and colorless; lobes shallowly 2-lobed 0.1--0.2 of their length, broadly triangular, entire or shallowly emarginate at the apex; oil bodies usually absent. Underleaves minute, 0.1--0.2 size of leaves, ovate-elliptical, unlobed to 2-lobed. Sexual condition paroicious. Specialized asexual reproduction absent. Antheridia axillary, male bracts similar to leaves, 1--3-androus, antheridial stalk 2-seriate. Gynoecia terminal on main stem, bulbous, bracts in several pairs, bearing slime papillae. Perianth absent. Perigynium fleshy, cup-like, densely rhizoidous. Capsule ovoid, wall 2-stratose. Elaters 6--8 m m wide. Spores 12--14 m m.

             Species 1 (1 in the flora): European Alps and High Arctic regions of the Northern Hemisphere.


Hedderson, T. A., L. Söderström and G. R. Brassard. 2001. Hepaticae of the Torngat Mountains, northern Labrador, Canada. Lindbergia 26: 143--156. Schuster, R. M. 1974. Prasanthus Lindb. & Arn. In: R. M. Schuster, 1966--1993. Hepaticae and Anthocerotae of North America, New York. Vol. 3. pp. 157--166. Schuster, R. M. and N. Konstantinova. 1996. Studies on the distribution of critical arctic/subarctic Hepaticae with special reference to taxa found in Russia. Lindbergia 21: 26--48.

1. Prasanthus suecicus (Gottsche) Lindberg Kgl. Sv. Vetensk-Akad. Handl. 23 (5): 62. 1889

             Gymnomitrium suecicum Gottsche Fl. Danica 16: 20. 1871

Plants with aerial shoots 2--6 ´ 0.5--0.7 mm, whitish-green to grayish-green. Stem subterranean rhizome to 1 cm, branches occasionally leafless, 150--500 m m wide, stolons elongated, densely rhizoidous, rhizoids brownish. Lateral leaves transverse, imbricate, elliptical, 450--600 ´ 450--850 m m; lobe margins entire; cell shape variable, marginal cells 10--15 m m, median cells 15--20 ´ 20--25 m m, basal cells 20--60 m m, surface smooth, cell walls thickened, trigones small and not bulging. Underleaves occasionally present on subterranean stem, ovate-semicircular, margins entire. Gynoecial bracts closely imbricate, connate at base, bracteoles lanceolate. Archegonia 10--12. Calyptra purplish-red. Seta ca. 5 mm. Capsule wall exterior layer with nodular thickenings, interior layer with semiannular thickenings. Elaters 2-spiraled, reddish-brown. Spores finely papillose, reddish.

             Bare glacial soil; Greenland; Nfld. (Laborador, T. A. Hedderson et al. 2001), Que. (R. M. Schuster and N. Konstantinova (1996); Europe (Austria, Finland, Italy, Norway, Russia, Sweden), Asia (Siberia).

This is a species of Greenland, the European Alps, and High Arctic regions generally.