Psilopilum cavifolium

(Wilson) I. Hagen

Bryologist 19: 70. 1916,

Synonyms: Oligotrichum laevigatum var. cavifolium (Wilson) FryePsilopilum cavifolium var. anomalum (I. Hagen) BrotherusPsilopilum tschuctschicum unknown
Basionyms: Polytrichum cavifolium Wilson
Treatment appears in FNA Volume 27. Treatment on page 146. Mentioned on page 147.
Click plate for higher resolution version.
Stems 6–10 mm. Leaves 2–3 mm, erect-appressed and somewhat wrinkled when dry, spreading when moist, oblong-ovate, concave and distinctly channeled, the apex cucullate, usually minutely apiculate; margins entire or denticulate near apex; costa ending in apex or very shortly excurrent, abaxially smooth or faintly roughened near apex; lamellae 7–10, 6–12 cells high, in profile entire or crenulate with bulging cell walls; cells of leaf base short-rectangular, narrower toward margin; median cells of lamina 15–20(–24) µm wide, thin- to firm-walled, becoming narrower and obliquely rhombic at the margin; perichaetial leaves 2.5–3.5 mm. Seta reddish brown, 8–18 mm. Capsule 3.2–5 mm, pale greenish brown, dark brown to blackish when old, long-cylindric, moderately to strongly curved, only rarely somewhat gibbous; peristome teeth 250–380 µm.

Habitat: Common, especially in lowland and coastal areas throughout arctic North America, on non-calcareous soil and gravel in areas of local disturbance, alluvium, slumping banks of streams and lakes, tussocks, frost boils, late snow patches, rarely submerged in snow melt streams
Elevation: low to moderate elevations (0-1200 m)

Distribution

V27 181-distribution-map.gif

Greenland, Nunavut, Yukon, Alaska, n Europe, Asia (n Siberia), Atlantic Islands (Iceland).

Discussion

This species typically has entire leaves, lamellae with entire margins, and ± symmetrical, long- cylindric capsules. Psilopilum laevigatum differs in its more slender, wiry appearance, with smaller, erect-incurved, bordered leaves, margins of lamellae incised and dentate in profile, and capsules distinctly asymmetrically ovoid and gibbous. Variety anomalum has leaf margins finely denticulate towards the apex, and less regular, gibbous capsules. Such intermediates may represent hybrids between the two species (D. G. Long 1985). In Nunavut, it is known from Baffin Island, Ellesmere Island, and the Arctic Archipelago.

References

None.

Lower Taxa

No lower taxa listed.

Facts about "Psilopilum cavifolium"
AuthorGary L. Smith Merrill +
Authority(Wilson) I. Hagen +
BasionymsPolytrichum cavifolium +
DistributionGreenland +, Nunavut +, Yukon +, Alaska +, N Europe +, Asia (n Siberia) + and Atlantic Islands (Iceland). +
Elevationlow to moderate elevations (0-1200 m) +
HabitatCommon, especially in lowland and coastal
Common, especially in lowland and coastal areas throughout arctic North America, on non-calcareous soil and gravel in areas of local disturbance, alluvium, slumping banks of streams and lakes, tussocks, frost boils, late snow patches, rarely submerged in snow melt streams
hes, rarely submerged in snow melt streams +
IllustratorPatricia M. Eckel +
Publication titleBryologist +
ReferenceNone +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse grained fna xml/V27/V27 181.xml +
SynonymsOligotrichum laevigatum var. cavifolium +, Psilopilum cavifolium var. anomalum + and Psilopilum tschuctschicum +
Taxon familyPolytrichaceae +
Taxon namePsilopilum cavifolium +
Taxon parentPsilopilum +
Taxon rankspecies +
VolumeVolume 27 +