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Preissia quadrata; Blister Ribbon   

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Preissia quadrata
Preissia quadrata
Blister Ribbon
Photographer: Dr. Amadej Trnkoczy

ID: 0000 0000 1218 3132 (2018-12-26)

Copyright © 2018 Dr. Amadej Trnkoczy

  • date of photo  May 19, 2010
  • latitude 46.31178   longitude 13.55632     View on Google Maps.
  • location   Bovec basin, at the foot of Mt. Polovnike ridge, south of village Čezsoča, East Julian Alps (Posočje, Slovenia)
  • notes   Slo.: robata stisnjenka - syn.: Preissia commutata Nees - Habitat: roadside of forest road escarpment, mixed wood edge; fairly steep mountain slope, north aspect; relatively cool and moist place; mostly in shade; calcareous ground; exposed to direct rain; average precipitations ~ 3.000 mm/year, average temperature 7-9 deg C, elevations 510 m (1.670 feet), alpine phytogeographical region. - Substratum: sandy moist soil. - Comment: Preissia quadrata is a thallose liverwort widely distributed in north hemisphere. As a member of liverworts it possibly belongs to the most early-evolved group of plants colonizing land environments. It is strictly bound to calcareous ground. Thalli produce male and female sexual organs in a form of up to 2 cm long stalks with flat or lobed discs at their apices. Smaller, male stalks are called antheridiophore and taller female stalks archegoniophore arpocephalum. Sometimes both appear on the same thallus (monoicous plants) or thalli have gametophytes that produce only sperm or eggs but never both (dioicous plants). Sperms are distributed by splashing rain drops but they can also swim the whole way to the female receptacles. This is of cause possible only if both male and female receptacles are surrounded by water (Ref.: 2). So water is essential for sexual propagation of these creatures. - Ref.: (1) Ian Atherton, Ed., Mosses and Liverworts of Britain and Ireland - a field guide, British Bryological Society (2010), p 257; available at: (2) (accessed Dec. 26.2018) (3) (accessed Dec. 26. 2018)
  • camera   Nikon D700 / Nikkor Micro 105mm/f2.8
  • contributor's ID #  Bot_420/2010_DSC2259
  • photo category: Plant - mosses/etc

  • common names   Blister Ribbon, Narrow Mushroom-headed Liverwort (photographer)
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    Using this photo   The thumbnail photo (128x192 pixels) on this page may be freely used for personal or academic purposes without prior permission under the Fair Use provisions of US copyright law as long as the photo is clearly credited with © 2018 Dr. Amadej Trnkoczy. For other uses, or if you have questions, contact Dr. Amadej Trnkoczy amadej.trnkoczy[AT] (Replace the [AT] with the @ symbol before sending an email.)


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