Lecidea confluentula Müll. Arg.

Flora, 55: 536, 1872.
Synonyms: Lecidea matildae H. Magn.; Lecidea rimiseda Nyl.
Distribution: N - TAA.
Description: Thallus crustose, endosubstratic and poorly evident ot 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, 0.2-0.8(-1.5) 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, 50-100 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 (3-)5-6.2 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).
Note: known from northwestern Europe and the French Alps (Hertel 2006), this silicicolous species is related to L. fuscoatra, but is most frequent above treeline. Reported from Italy by Hertel (1995) without further details; the record (Hertel in litt.) refers to the Geisler Mnts. in south Tyrol.
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
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent

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Predictive model