Rhizomnium nudum
Rhizomnium magnifolium
naked rhizomnium moss
grandleaf rhizomnium moss, hairy lantern moss, large-leaf leafy moss
dark red or reddish brown when old;
micronemata absent.
reddish brown to black when old;
micronemata present, often absent on young stems.
green to dark green, weakly contorted when dry, broadly obovate, elliptic, or often ± orbicular, (3.8–)4–6(–9) mm;
margins green or sometimes pale reddish, 1–4-stratose;
apex rounded, occasionally retuse, rarely short-apiculate;
costa ending well before apex to 7/8 leaf length or rarely subpercurrent;
medial laminal cells elongate or short-elongate, (60–)70–130(–170) µm, rarely collenchymatous, walls with broad central pits;
marginal cells linear or short-linear, in (1–)2(–3) rows.
green to dark green, contorted when dry, obovate or broadly elliptic, 4–9(–12) mm;
margins green or sometimes reddish, 1- or 2-stratose;
apex rounded or retuse, sometimes emarginate, rarely weakly apiculate;
costa ending well before apex, subpercurrent, or percurrent, sometimes 2-fid distally;
medial laminal cells elongate, (55–)80–100(–130) µm, weakly collenchymatous, walls lightly pitted;
marginal cells linear, in 2–3(–4) rows.
1–2.5 cm.
2–4 cm.
dioicous.
dioicous.
ovate, 2.5–3.5 mm;
operculum conic-apiculate;
exostome yellow, lamellae 18+.
oblong or cylindric, 3–4 mm;
operculum conic-rostrate;
exostome greenish yellow, lamellae 18+.
25–35 µm.
25–35 µm.
Rhizomnium nudum
Rhizomnium magnifolium
Rhizomnium nudum is one of the most easily recognized species of the genus. The plants are characterized by the absence of micronemata, by their broad, weakly contorted, and nearly flat leaves when dry, and by having thin central laminal cell walls (broad pits), the bar bell appearance of the walls observed in leaf sections. The leaves are only weakly undulate when moist.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Rhizomnium magnifolium, although usually large, can sometimes be small and has been confused with R. pseudopunctatum. Fertile plants of R. pseudopunctatum are synoicous, but sterile collections are common and often ambiguous. Rhizomnium magnifolium has larger and much less pitted laminal cells than R. pseudopunctatum, and its margins are composed mainly of linear cells and are usually 2-stratose; those of R. pseudopunctatum are composed of shorter and usually rectangular or rhomboidal cells and are always 1-stratose. The length of the costa is frequently used to separate these two species, but this character is unreliable with smaller specimens of R. magnifolium. The costa of R. magnifolium is often subpercurrent or percurrent, whereas the costa of R. pseudopunctatum is usually much shorter, and only occasionally subpercurrent and rarely percurrent. For comparison with the similar 2. R. appalachianum, see the discussion there.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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