Hypnum lindbergii
Hypnum callichroum
Lindberg's claw-moss, Lindberg's hypnum moss
downy claw-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 to circinate-secund, ovate to ovate-lanceolate, somewhat curved to insertion, gradually narrowed to apex, 1.5–2 × 0.7–0.8 mm;
base decurrent;
margins plane, serrulate at apex;
acumen slender;
costa double and short or obscure;
alar cells abruptly enlarged, region well defined, 1–3 cells high, outermost cell walls thinner;
basal laminal cells shorter, broader than medial cells, yellowish to green, walls porose;
medial cells 50–60 × 8 µm. Sexual condition dioicous;
inner perichaetial leaves oblong-lanceolate, margins toothed near apex, apex finely pointed, costa obscure.
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.
red-brown, 2–3.5 cm.
inclined, pale brown, cylindric, 2–3 mm;
annulus 2- or 3-seriate;
operculum conic-convex;
endostome cilia 2–4.
inclined, red-brown, cylindric, 1.5–2 mm;
annulus 1- or 2-seriate;
operculum conic;
endostome cilia appendiculate.
Hypnum lindbergii
Hypnum callichroum
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.)
In North America, Hypnum callichroum is frequent only near the Pacific Coast, where it is relatively easy to determine; the shiny plants produce sporophytes in summer. The alar cells are bounded by quadrate to triangular cells distally. The presence of a hyalodermis and the distinct alar region of thin-walled cells that are strongly differentiated from the adjacent cells are reliable characters. However, material without sporophytes can be difficult to determine. Epiphytic specimens frequently have sporophytes, while terrestrial ones generally lack them.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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