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Cladonia digitata (L.) Hoffm.

Synonyms:

Family: CLADONIACEAE

Habitat: Ubiquitous

Description

    Basal squamules to 1 cm diam., lobes scarcely indented often dominant, spreading ± horizontally, erected and upturned margins, upper surface pale green, pale yellowish green, lower surface pale grey-greenish, farinose-sorediate (clearly visible at margins if upturned), sometimes with a distinct orange tinge (K+ purple). Podetia 0.5-1 cm tall, straight or curved-decumbent, often emerging from squames center, surface entirely farinose-sorediate, green-greyish, apices characterized by irregular, mainly small, narrow, scyphi, base sometimes with small scales and more or less "peeled" top. Apothecia small, rounded and often digitated, in crowns at ends of pointed apices or on short projections from margins of scyphi, red. Pycnidia similar to apothecia but not digitated, red (a carefull observation is required since they are brown when young, and can be confused with species of which apothecia are brown). Photobiont: Trebouxioid. Thallus C-, K + yellow, KC- , Pd+ orange. Rather rare species coming at the base of old more or less rotten trunks in old humid forests. Easily confused with Cladonia polydactyla whose base scales are smaller and more incised and whose underside is not soredate, the latter species also has better-formed sections bordered by digitate growths, but there seem to be "embarrassing" intermediaries.

N.B. It is described Cladonia digitata morpho ceruchoides which has very sorediate basal squamules (lower face and margin) which gives them a mealy appearance and also pointed or truncated scyphus and without cup with only pycnidia. We have not separated this morph which comes on moist soils rich in woody debris of dark forests because there are all the forms of transition with the type which can otherwise come in mixture (see the photographs of Belgium).
 
 
 
 

 

 







Cladonia digitata Hermeton sur Meuse 1
Jacques HAINE



Cladonia digitata Hermeton sur Meuse 2
Jacques HAINE



Cladonia digitata Hermeton sur Meuse 3
Jacques HAINE



Cladonia digitata Huelgoat 3
Bernard BOUFFINIER



Cladonia digitata Huelgoat 1
Bernard BOUFFINIER



Cladonia digitata avec Trapeliopsis pseudogranulosa Huelgoat 2
Bernard BOUFFINIER



Cladonia digitata Huelgoat 4
Bernard BOUFFINIER



Cladonia digitata Huelgoat 5
Bernard BOUFFINIER



Cladonia digitata Huelgoat 6
Bernard BOUFFINIER



Cladonia digitata Cast 1
Bernard BOUFFINIER



Cladonia digitata Bannalec 1
Tony ROBINET



Cladonia digitata Stérile Bannalec 2
Tony ROBINET



Cladonia digitata Locronan 1
Bernard BOUFFINIER



Cladonia digitata Landévennec 1
Bernard BOUFFINIER



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