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Lichen: Cladonia squamosa

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Cladonia squamosa: note the lack of cups and the forked podetia.

Cladonia squamosa: note the lack of cups and the forked podetia.

Name: Cladonia squamosa (Scop.) Hoffm. (1796) var.squamosa

Pronunciation: Cladonia squamosa

Cladonia squamosa: note the 'bald' patches where squamules have fallen off.

Cladonia squamosa: note the 'bald' patches where squamules have fallen off.

Conservation Evaluation: Least Concern

Body Type: Cladonia -  squamulosemap-cladonia-squamosa

Description: The primary squamules form dense mats and range in size from 2 mm to 7 mm in length and just 1 mm wide. They are greenish to brown on the upper surface and white below. Shape varies from crenate to incised to subdigitate. The podetia are characteristically tall reaching heights of 9 cm although typically they are 2 cm to 7 cm tall. Typically they are cupless but small cup-like structures may be present  in an oblique position near the top.  Apothecia are rare and when present are brown in colour and very small. Pycnidia may also be present.

Chemical Tests: Thallus tests as follows:  C negative, K negative, KC negative, Pd negative, UV positive (vivid white).

Nature Notes: This is a very variable species as the podetia are often stunted; the squamules may be falling off. Soredia are absent. Found on mossy rocks near streams (where these photographs were taken), rotting tree stumps and heathland.

Vice County distribution map of Cladonia squamosa: See Map

Link: Map this species on the Lichen Survey

Other species recorded in Ireland

  • Cladonia arbuscula (Wallr. )Flot. [10]
  • Cladonia azorica Ahti
  • Cladonia bellidiflora (Ach.) Schaer.
  • Cladonia caespiticia (Pers.) Flörke
  • Cladonia cariosa (Ach.) Spreng.
  • Cladonia cervicornis (Ach. ) Flot.
  • Cladonia cervicornis ssp. verticillata (Hoffm.) Ahti
  • Cladonia chlorophaea (Flörke ex Sommerf.) Spreng. [11]
  • Cladonia ciliata Stirt.
  • Cladonia ciliata var. tenuis (Flörke) Ahti
  • Cladonia coccifera (L.) Willd. [12]
  • Cladonia coniocraea (Flörke) Spreng.
  • Cladonia cornuta (L.) Hoffm.
  • Cladonia crispata var. cetrariiformis (Delise ex Duby) Vain.
  • Cladonia cyathomorpha Stirt. ex Walt.Watson
  • Cladonia digitata (L.) Hoffm.
  • Cladonia diversa Asperges [13]
  • Cladonia fimbriata (L.) Fr.
  • Cladonia firma (Nyl.) Nyl.
  • Cladonia floerkeana (Fr.) Flörke
  • Cladonia foliacea (Huds.) Willd.
  • Cladonia furcata (Huds.) Schrad.
  • Cladonia furcata ssp. subrangiformis (Sandst.) Abbayes
  • Cladonia glauca Flörke
  • Cladonia gracilis (L.) Willd.
  • Cladonia humilis (With.) J.R.Laundon
  • Cladonia incrassata Flörke
  • Cladonia luteoalba Wheldon & A.Wilson
  • Cladonia macilenta Hoffm.
  • Cladonia ochrochlora Flörke
  • Cladonia parasitica (Hoffm.) Hoffm.
  • Cladonia peziziformis (With.) J.R.Laundon
  • Cladonia pleurota (Flörke) Schaer.
  • Cladonia pocillum (Ach.) Grognot
  • Cladonia polydactyla (Flörke) Spreng.
  • Cladonia portentosa (Dufour) Coem.
  • Cladonia pyxidata (L.) Hoffm.
  • Cladonia ramulosa (With.) J.R.Laundon
  • Cladonia rangiferina (L.) F.H.Wigg.
  • Cladonia rangiformis Hoffm.
  • Cladonia scabriuscula (Delise) Nyl.
  • Cladonia stereoclada Abbayes
  • Cladonia strepsilis (Ach.) Grognot
  • Cladonia subcervicornis (Vain.) Kernst.
  • Cladonia subulata (L.) F.H.Wigg.
  • Cladonia sulphurina (Michx.) Fr.
  • Cladonia uncialis ssp. biuncialis (Hoffm.) M.Choisy
  • Cladonia zopfii Vain.

Text and images © Paul Whelan, 2009.