Hypnum subimponens
Hypnum jutlandicum
curly claw-moss, hypnum moss
hypnum moss
leaves circinate-secund, ovate-lanceolate, gradually tapering to insertion, gradually narrowed to apex, 1.5–2.8 × 0.4–0.6 mm;
base not decurrent;
margins plane, sinuate proximally, serrate toward apex;
apex narrowly acuminate;
costa double, short, indistinct, less than 1/3 leaf length;
alar region slightly differentiated, of 3 or 4 cells at extreme basal angles;
basal laminal cells shorter, broader than medial cells, not strongly pigmented, walls pitted;
medial cells 50–80(–90) × 3–4 µm. Sexual condition dioicous;
inner perichaetial leaves lanceolate, weakly or not plicate, margins slightly toothed or entire near apex.
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.
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.
red-brown, 2.5–3 cm.
erect to suberect, light brown, cylindric, 3–5 mm;
annulus 1–3-seriate;
operculum conic or rostellate;
endostome cilia unknown.
unknown in North America.
Hypnum subimponens
Hypnum jutlandicum
Specimens of Hypnum subimponens from Arctic regions are problematic; in fact, any specimens from horizontal surfaces can be difficult to place accurately. Sporophytes, produced in spring, are frequent only on vertical surfaces and then often abundant. Unlike similar species in western North America, H. subimponens produces cylindric, erect capsules (slightly curved below the mouth when mature). Hypnum lindbergii has falcate-secund leaves, while those in H. subimponens are circinate-secund to strongly hamate. Key traits of the stem leaves separate H. subimponens from H. hamulosum, and the former is usually more than twice the size of the latter. See also discussions of 3. H. callichroum, 11. H. holmenii, and 16. H. plicatulum. Plants of H. subimponens have branches 0.5–1 mm wide; the alar cells are slightly bulging, hyaline, and thin-walled.
(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.)
BC
CalFlora
Flora NW
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WildflowerSearch
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