Rhizomnium glabrescens
Rhizomnium magnifolium
fan moss, large leafy moss, rhizomnium moss
grandleaf rhizomnium moss, hairy lantern moss, large-leaf leafy moss
reddish brown, brown, or black when old;
micronemata absent.
reddish brown to black when old;
micronemata present, often absent on young stems.
green to dark green, slightly contorted and somewhat undulate when dry, obovate or elliptic, (2.5–)4.5–6 mm;
margins green or sometimes reddish or brownish, 2–4-stratose;
apex rounded or occasionally obtuse or retuse, short-apiculate;
costa subpercurrent or percurrent;
medial laminal cells short-elongate, sometimes elongate or ± isodiametric, (35–)45–60(–70) µm, weakly or not collenchymatous, walls pitted;
marginal cells linear, in 3–4(–5) 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.
(2–)3–5 cm.
2–4 cm.
dioicous.
dioicous.
oblong or cylindric, 3–4.5 mm;
operculum conic-apiculate or conic-rostrate;
exostome greenish yellow, lamellae 18+.
oblong or cylindric, 3–4 mm;
operculum conic-rostrate;
exostome greenish yellow, lamellae 18+.
30–45 µm.
25–35 µm.
Rhizomnium glabrescens
Rhizomnium magnifolium
Rhizomnium glabrescens, common in coastal forests along the west coast, is small but distinctive. Male plants are characterized by rosettes of large leaves at the tops of the nearly naked stems. Small, scalelike leaves are present along the stem below the upper rosette. The stems of female and sterile stems have relatively large leaves. Sterile stems often arch, resembling those of Plagiomnium, but are always the same length or shorter than the fertile stems.
(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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USDA Plants Database
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