Hypnum lindbergii
Hypnum jutlandicum
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.
4–10 cm, yellowish green to pale brown, creeping, ascending, or erect, strongly complanate-foliate, densely to sparsely pinnate, branches 0.4–0.7+ cm;
hyalodermis absent, central strand weak;
pseudoparaphyllia filamentous to lanceolate, occasionally 2-fid.
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.
loosely imbricate, straight to falcate-secund, ovate or oblong-lanceolate, gradually narrowed to apex, 1.7–2.2(–2.5) × 0.6–0.8(–0.9) mm;
base not decurrent, not auriculate;
margins plane or recurved basally, usually markedly serrulate distally;
acumen short;
costa double and short or indistinct;
alar region not well defined;
proximal cells somewhat enlarged and somewhat decurrent at extreme marginal cell;
basal laminal cells shorter, broader than medial cells, light yellow or unpigmented, walls often porose;
medial cells (60–)70–90(–100) × 3 µm. Sexual condition dioicous;
inner perichaetial leaves oblong-lanceolate, margins distinctly serrulate in apex, costa indistinct.
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 in North America.
Hypnum lindbergii
Hypnum jutlandicum
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 jutlandicum is largely an amphi-Atlantic species that may occur in Alaska. The pale yellowish green, glossy, pinnate plants are very distinctive; they might be confused with H. imponens, but H. jutlandicum has yellow rather than red-brown stems and golden yellow rather than pale yellow leaves. The pseudoparaphyllia of H. imponens are more broadly foliose than the nearly filiform ones of H. jutlandicum. Distinction from H. cupressiforme is less apparent, but the usually more complanate pale green plants of H. jutlandicum are usually sufficient to separate it. Plants of H. jutlandicum have branches emerging in a horizontal plane; the pseudoparaphyllia are terminated by a 1-seriate tip of several elongate cells; the alar cells are usually strongly excavate and sometimes brown; and the distal laminal cells are subquadrate and 3–5(–7) along the margin.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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