Overview

Comprehensive Description

Description

 Verrucaria maura is a lichen that forms a thin, matt-black layer on rock surfaces that can resemble an oil stain. Reproductive bodies may be present as tiny black spots. Under magnification the surface is seen to be covered with a mesh of fine cracks that resemble dried mud.
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Distribution

National Distribution

Canada

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Ecology

Habitat

Depth range based on 156 specimens in 1 taxon.
Water temperature and chemistry ranges based on 35 samples.

Environmental ranges
  Depth range (m): 0 - 0
  Temperature range (°C): 11.471 - 12.348
  Nitrate (umol/L): 4.729 - 7.121
  Salinity (PPS): 35.184 - 35.363
  Oxygen (ml/l): 6.069 - 6.200
  Phosphate (umol/l): 0.336 - 0.439
  Silicate (umol/l): 2.315 - 3.285

Graphical representation

Temperature range (°C): 11.471 - 12.348

Nitrate (umol/L): 4.729 - 7.121

Salinity (PPS): 35.184 - 35.363

Oxygen (ml/l): 6.069 - 6.200

Phosphate (umol/l): 0.336 - 0.439

Silicate (umol/l): 2.315 - 3.285
 
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 Verrucaria maura is found intertidally on almost all rocky shores except where the rocks are soft and crumbly. It is usually the main constituent of the black band of lichens below a band orange lichens and extends from well above the level of high water down to the zone of mussels and barnacles. The width of the band depends on the wave and tidal exposure of the shore.
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G4 - Apparently Secure

Reasons: This maritime lichen occurs from central Alaska to northern Washington on the Pacific coast and from New Hampshire to the Island of Newfoundland on the Atlantic coast. It is also found in the British Isles, France, Germany, Sweden, and Denmark. This species grows on rocks from the intertidal to salt-spray zones.

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