Lecidea confluentula Müll. Arg.

Flora, 55: 536, 1872.
Synonyms: Lecidea matildae H. Magn.; Lecidea rimiseda Nyl.
Description: Thallus crustose, endosubstratic and poorly evident or thinly episubstratic and visible only around the apothecia, greyish white, ecorticate, often delimited by a dark prothallus. Medulla I-, filled with small crystals. Apothecia lecideine, black, (0.2-)0.5-0.8 mm across, with a flat to finally convex, usually epruinose disc and a thick, raised, mostly persistent proper margin (excluded in old, very convex apothecia). Proper exciple 45-75 µm wide laterally, dark brown-grey in the outer rim, colourless within, C+ red, K-, sparsely inspersed with small crystals, composed of thick, densely arranged hyphae; epithecium olive-brown to dark blue-green, K-, N+ purple-red; hymenium colourless, (45-)50-65 μm high; paraphyses coherent, branched in upper part, the apical cells up to 4.5 μm wide; hypothecium dark brown to blackish brown. Asci 8-spored, narrowly clavate, thick-walled, with a K/I+ pale blue tholus and a strongly amyloid, thin apical cushion, surrounded by a I+ blue outer layer, Lecidea-type. Ascospores 1-celled, hyaline, broadly ellipsoid, 9-15 x (4-)5-6.5 µm, 1.8-2.5 times a long as wide. Photobiont chlorococcoid. Spot tests: thallus K-, C- or C+ pink, KC+ pink, P-, UV- (reactions often weak and ephemeral). Chemistry: thallus and exciple of apothecia with the gyrophoric acid syndrome (best revealed by TLC).
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: extremely rare
Montane belt: absent
Dry submediterranean belt: absent
Humid submediterranean belt: absent
Padanian area: absent

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Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_4/Lecidea_confluentula.htm
France, Lanslebourg-Mont-Cenis - Savoie - (73) - anciennes carrières sous le barrage, sur schistes non calcaires, alt, : 2000 m
4/8/2011


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_4/Lecidea_confluentula.htm
France, Lanslebourg-Mont-Cenis - Savoie - (73) - anciennes carrières sous le barrage, sur schistes non calcaires, alt, : 2000 m
4/8/2011


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_4/Lecidea_confluentula.htm
France, Lanslebourg-Mont-Cenis - Savoie - (73) - anciennes carrières sous le barrage, sur schistes non calcaires, alt, : 2000 m
4/8/2011


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_4/Lecidea_confluentula.htm
France, Lanslebourg-Mont-Cenis - Savoie - (73) - anciennes carrières sous le barrage, sur schistes non calcaires, alt, : 2000 m
4/8/2011


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_4/Lecidea_confluentula.htm
France, Lanslebourg-Mont-Cenis - Savoie - (73) - anciennes carrières sous le barrage, sur schistes non calcaires, alt, : 2000 m
4/8/2011


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_4/Lecidea_confluentula.htm
France, Lanslebourg-Mont-Cenis - Savoie - (73) - anciennes carrières sous le barrage, sur schistes non calcaires, alt, : 2000 m
4/8/2011


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_L/Texte_L_4/Lecidea_confluentula.htm
France, Lanslebourg-Mont-Cenis - Savoie - (73) - anciennes carrières sous le barrage, sur schistes non calcaires, alt, : 2000 m
4/8/2011