Miriquidica intrudens (H. Magn.) Hertel & Rambold

Mitt. bot. Staatss. München, 23: 386, 1987. Basionym: Lecanora intrudens H. Magn. - Bot. Not.: 8-9, 1942.
Synonyms:
Distribution: N - Frl, TAA (Hafellner & al. 2014), Piem (Hafellner & al. 2014).
Description: Thallus crustose, areolate, dark chestnut brown to brown-black, glossy, sorediate, starting the life-cycle on the thalli of crustose lichens, especially yellow Rhizocarpon-species, forming up to 1.5 cm wide islands on the thalli of the host. Areoles contiguous, almost subsquamulose, (0.2-)0.4-2(-3) mm wide, concave with a central depression, paler along the somehow raised margins; soredia black, mainly marginal, sometimes coalescing into irregular 0.2-0.6 mm wide, soralia-like patches. Apothecia rare, lecideine, 0,3-0.7(-1) mm across, immersed to sessile, with a brown-black to black disc and a thin proper margin. Proper exciple olivaceous brown or olive-green in outer part, colourless within; epithecium brown, N-; hymenium colourless 40-75 µm high, I+ blue; paraphyses branched and anastomosing, 1.7-2 µm thick at mid-level, the apical cells more or less clavate, 2-3 µm wide; hypothecium colourless. Asci 8-spored, more or less of the Lecanora-type, but with a weakly defined apical cushion and ocular chamber. Ascospores 1-celled, hyaline, ellipsoid to oblong, (7-)8-10(-18) x (2-)4-6(-8) µm. Pycnidia rare, black, immersed. Conidia thread-like, curved, 15-24 x 0.5-1 µm. Photobiont chlorococcoid. Spot tests: thallus and medulla K- or rarely K+ yellow, C-, KC-, P-, UV-; soredia N+ violet. Chemistry: miriquidic acid, rarely replaced by stictic acid.
Note: a probably circumpolar, arctic-alpine silicicolous species which was largely overlooked in the past, starting the life-cycle on yellow Rhizocarpon-species; certainly more widespread near and above treeline in the Alps; perhaps confused with Protoparmelia leproloma, from which it differs in important morphological and chemical characters.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)
paras crustose lichens, especially yellow Rhizocarpon spp.

Commonnes-rarity: (info)

Alpine belt: rare
Subalpine belt: very 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

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples


P.L. Nimis CC BY-SA 4.0
TSB 33716



Pier Luigi Nimis - CC BY-SA 4.0
TSB 38561



P.L. Nimis CC BY-SA 4.0
TSB 38562



P.L. Nimis CC BY-SA 4.0
TSB 38562



Pier Luigi Nimis - CC BY-SA 4.0
TSB 38561