(Last Modified On 2/24/2011)
Although M. marginatum is
considered a lowland species in the Northern Hemisphere (Koponen, 1980), in
Central America it is known only from a few high-elevation localities in
Guatemala. Central American collections of M. marginatum have both
paroicous and synoicous inflorescences and while its capsules are unknown in
the region some collections have old, battered setae. Mature plants of M.
marginatum have leaves with dark‑red leaf limbidia, doubly serrate
margins, and firm‑walled, rounded‑hexagonal leaf cells. Care should
be used when examining young plants, however, because their leaves can be
nearly entire, have thin‑walled cells and costae that end well below the
Bridel (1803, Fig. 1
a–d); Hooker and Taylor (1818, Pl. 31); Bruch and Schimper (1838a, Pl. 391);
Husnot (1890, Pl. 70 1–5); Dixon and Jameson (1896, Tab. 47A) Grout (1906, Pl.
51 1–16); Bartram (1933, Fig. 93 a–d); Grout (1940, Pl. 105 1); Bartram (1949,
Fig. 83 E–F); Nyholm (1958, Fig. 144B); Lawton (1971, Pl. 105 7–12); Flowers
(1973, Pl. 86 1–8); Gangulee (1974, Fig. 504); Koponen (1974, Figs. 22–27);
Smith (1978, Fig. 209 1–4); Koponen (1980, Figs. 21–23); Crum and Anderson
(1981, Fig. 271 A–E); Ireland (1982, Pl. 190 1–8); Li (1985, Fig. 81 7–9);
Nyholm (1993, Fig. 194 B); Sharp et al. (1994; Fig. 400 a–d); Abramov
& Volkova (1998, Pl. 66 9–12). Figure 175.
On soil and bare rocks
around streams and waterfalls, also on bank in meadow; 2700–3900 m.
Distribution in Central America:
GUATEMALA. Huehuetenango: Steyermark 48399 (F); San Marcos: Steyermark
Western Canada, Eastern Canada, Northwestern, North-Central, Northeastern,
Southwestern, South‑Central, and Southeastern U.S.A.; Mexico; Central
America; Northern, Middle, East, Southwestern, and Southeastern Europe;
Siberia, Russian Far East, Caucasus, Middle Asia, Mongolia, China, Western
Asia; Northern Africa; Indian Subcontinent; North‑Central Pacific.