Rhizomnium nudum
naked rhizomnium moss
dark red or reddish brown when old;
micronemata absent.
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.
1–2.5 cm.
dioicous.
ovate, 2.5–3.5 mm;
operculum conic-apiculate;
exostome yellow, lamellae 18+.
25–35 µm.
Rhizomnium nudum
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.)
BC
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
