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Tephromela atra (Huds.) Hafellner var. atra

Synonyms:

Family: TEPHROMELATACEAE

Habitat: Ubiquitous

Description

    Thallus crustose, to 15 cm across, usually rather thick, more or less irregular and cracked, areolate, whitish to pale dull white-greyish, margin thin, prothallus black. Apothecia developing on a regular pattern from the center, sessile, 1-3 mm diam., disc flat, black, exciple white, thick, irregular, contorted to wavy, more or less crenulate; in section, the hymenium is purple, sometimes directly visible in old empty apothecia. Ascospores simple, ellipsoid, 10-15 x 6-8 µm. Photobiont: Chlorococcoid. C-, K+ yellow, KC+ yellow, Pd-. Not especially maritime, and found everywhere on nutrient-rich acid rocks, but also rather common in the aerohaline zone where sometimes it contributes to the development of the 'white belt'. Near the seashore, this species is easily mistaken with Lecanora gangaleoides that is strongly maritime. The latter may be distinguished (sometimes difficultly) by its thallus greyish tinged-green and its margin, whitish, its apothecia with convex discs when mature and exciple regular, not contorted nor wavy, and above all its hymenium, brown-green in section.

    Two varieties of this common species are described:

Tephromela atra var. calcarea that grows on calcareous rocks.

Tephromela atra var. torulosa that grows on smooth bark of deciduous trees notably Fagus.*







Tephromela atra Kernisi
Alain GERAULT



Tephromela atra Pointe de Pen-Hir 2
Michel DAVID



Tephromela atra Le Passage
Alain GERAULT



Tephromela atra La Palue
Michel DAVID



Tephromela atra La Palue
Alain GERAULT



Tephromela atra Pen Hir
Michel DAVID



Tephromela atra Fouesnant 2
Joël QUERELLOU



Tephromela atra Fouesnant
Joël QUERELLOU



Tephromela atra Pointe de Pen-Hir 3
Michel DAVID



Tephromela atra Asque et paraphyses HĂ´pital-Camfrout 1
Jacques HAINE



Tephromela atra Coupe de l'hyménium Hôpital-Camfrout 2
Jacques HAINE



Tephromela atra Spores HĂ´pital-Camfrout 3
Jacques HAINE



Tephromela atra (left) et Lecanora gangaleoides (right) Crozon
Michel DAVID



Tephromela atra var. atra Coupe apothécie eau & K Pointe Armorique
Jacques HAINE



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