Arctoa hyperborea

(Gunnerus ex Withering) Bruch & Schimper

Bryol. Europ. 1: 157. 1846,

Basionyms: Bryum hyperboreum Gunnerus ex Withering Syst. Arr. Brit. Pl. ed. 4, 3: 811. 1801
Synonyms: Cynodontium hyperboreum (Gunnerus ex Withering) Hagen Dicranum hyperboreum (Gunnerus ex Withering) Smith
Treatment appears in FNA Volume 27. Treatment on page 363. Mentioned on page 362.
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Illustrator: Patricia M. Eckel
Plants in compact, dark green tufts. Stems 1–3(–5) cm. Leaves erect-spreading, lanceolate, subulate, 2–3 mm; costa 30–55 µm wide at base, short-excurrent, rough near tip; distal laminal cells mostly subquadrate (1–2:1), incrassate; basal laminal cells elongate, alar cells differentiated, quadrate or slightly enlarged. Seta 4–6(–8) mm. Capsule exserted, slightly curved, obscurely to distinctly ribbed when dry, annulus developed, separating; peristome large, not spreading outward when dry. Spores 18–30 µm.

Phenology: Capsules mature summer.
Habitat: Siliceous rock or soil
Elevation: high-alpine elevations


Arctoa hyperborea is a rare arctic-alpine moss found on rock ledges or crevices at high elevations. It is distinguished from other species of the genus by its short-excurrent costa, shorter seta (the length is highly variable), and peristome not spreading when dry.



Lower Taxa

No lower taxa listed.

Facts about "Arctoa hyperborea"
AuthorSteven G. Newmaster +
Authority(Gunnerus ex Withering) Bruch & Schimper +
BasionymsBryum hyperboreum +
DistributionGreenland + and Europe. +
Elevationhigh-alpine elevations +
HabitatSiliceous rock or soil +
IllustratorPatricia M. Eckel +
PhenologyCapsules mature summer. +
Publication titleBryol. Europ. +
ReferenceNone +
Source xml grained fna xml/V27/V27 508.xml +
SynonymsCynodontium hyperboreum + and Dicranum hyperboreum +
Taxon familyDicranaceae +
Taxon nameArctoa hyperborea +
Taxon parentArctoa +
Taxon rankspecies +
VolumeVolume 27 +