Hypnum lindbergii
Hypnum procerrimum
Lindberg's claw-moss, Lindberg's hypnum moss
hypnum moss
1–5 cm, reddish brown to yellowish green, brown with age, suberect to creeping, irregularly to sparsely branched to somewhat pinnate, branches 0.2–2 cm;
hyalodermis present, central strand well developed;
pseudoparaphyllia foliose.
leaves falcate-secund, ovate-oblong, gradually narrowing to apex, 1–1.5 × 0.5–0.8 mm;
base often auriculate;
margins plane, entire to sinuate;
acumen tapering;
costa double and slender or ecostate;
alar cells many, subquadrate to hexagonal, region well defined in auriculate portion, not excavate, 7–8 cells high along margin, 6–8 cells wide;
basal laminal cells slender, yellowish or brownish, walls porose;
medial cells 60 × 8 µm. Sexual condition dioicous.
falcate-secund (sometimes weakly so), oblong-ovate, not or slightly rounded to insertion, tapering gradually to apex, 0.5–2 × 0.5–1 mm;
base decurrent;
margins plane, entire to bluntly serrate especially in apex;
acumen slender or broad;
costa double, short;
alar cells abruptly enlarged, region well defined, in 2–4 rows along margins, outermost cell walls thinner;
basal laminal cells wider, shorter than medial cells, yellowish, walls porose;
medial cells 60–100 × 5–6 µm. Sexual condition dioicous;
inner perichaetial leaves oblong-lanceolate, margins serrulate at apex, apex attenuate, costa obscure.
reddish, 2.5–4 cm.
inclined, pale brown, cylindric, 2–3 mm;
annulus 2- or 3-seriate;
operculum conic-convex;
endostome cilia 2–4.
unknown.
Hypnum lindbergii
Hypnum procerrimum
Hypnum lindbergii is a species largely of temperate climates, most frequent in boreal and warm temperate regions, less frequent in the Arctic, occurring from sea level to alpine elevations; sporophytes are infrequently produced in spring and summer. Plants of H. lindbergii have few or no rhizoids; the supra-alar cells are shorter than the alar cells, in 1–3 rows; the capsules are furrowed when dry; and the endostome cilia are as long as the segments. The hyalodermis cortical cells, leaves usually curved to insertion, usually well-defined alar regions of swollen thin-walled cells, and often wide acute apex of many stem leaves usually separate this species from similar taxa. Hypnum pratense resembles H. lindbergii somewhat, but H. pratense tends to be very glossy, with stem leaves often complanate, and thin-walled alar cells absent.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Hypnum procerrimum has an interrupted distribution in Arctic and alpine areas of the Northern Hemisphere, usually in well-drained sites. Plants of H. procerrimum have blunt, weakly toothed pseudoparaphyllia and triangular alar regions; the medial laminal cells are linear-flexuose with somewhat pitted walls. The species is very distinctive; some small forms might be confused with Ctenidium molluscum, but the toothed leaves and the laminal cells often with projecting distal ends distinguish the latter.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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