Trapelia obtegens (Th. Fr.) Hertel

Ber. dtsch. bot. Ges., n. F., 4: 181, 1970. Basionym: Biatora coarctata subsp. obtegens Th. Fr. - Bot. Not.: 152, 1867.
Synonyms: Biatora coarctata var. obtegens (Th. Fr.) Stein; Gallowayiopsis obtegens (Th. Fr.) S.Y. Kondr.; Lecidea coarctata var. obtegens (Th. Fr.) Th. Fr.; Lecidea obtegens (Th. Fr.) Vain.
Distribution: N - Frl (Tretiach & Hafellner 2000).
Description: Thallus crustose, episubstratic, areolate, pale brownish grey to dull grey-brown, rarely green-grey, the areoles often scattered, strongly convex, sometimes more flattened later, with a more or less round outline or becoming slightly lobed, with abrupt margins, up to 0.72 mm wide, but often much smaller. Soralia either absent or sparse, or abundant, in which case the areoles are dissolved into soralia early on, and corticate areoles are inconspicuous. Cortex c. 10 μm thick, with a brown pigment and a thin epinecral layer. Apothecia lecideine, frequent also in sorediate morphs, 0.2-0.7 mm across, with a pinkish brown to finally brown-black, rough disc, a distinct, somewhat paler proper margin, and often, especially when young, a thin, often incomplete pseudothalline rim. Proper exciple of colourless hyphae embedded in a colourless to weakly pigmented gel; epithecium almost colourless to pale yellowish brown; hymenium colourless; paraphyses coherent, thin, densely branched and anastomosing, not thickened at apex; hypothecium colourless. Asci 8-spored, cylindrical-clavate, unitunicate, thin-walled, the apical dome K/I-, or weakly K/I+ blue, Trapelia-type. Ascospores 1-celled, hyaline, ellipsoid, 17-23 x 8.5-12.5 μm, thin-walled, with a perispore. Photobiont chlorococcoid. Spot tests: thallus and soredia K-, C-+ red, KC+ red, P-, UV+ whitish. Chemistry: gyrophoric acid (major), 5-O-methylhiascic acid (trace).
Note: on siliceous pebbles near the ground, sometimes on roofing tiles and over thin soil layers over siliceous substrata. The records from Latium reported by Nimis (1993: 711), and probably that by Bartoli (1997b), were due to misidentifications, and are not accepted here.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: rare
Oromediterranean belt: absent
Montane belt: rare
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
INDEX FUNGORUM GBIF DOLICHENS


Pier Luigi Nimis - CC BY-SA 4.0
TSB 41860



Pier Luigi Nimis - CC BY-SA 4.0
TSB 41860



Pier Luigi Nimis - CC BY-SA 4.0
TSB 41860



Pier Luigi Nimis - CC BY-SA 4.0
TSB 41860



Pier Luigi Nimis - CC BY-SA 4.0
TSB 41860



Pier Luigi Nimis - CC BY-SA 4.0
TSB 41860


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=606&lang=en
France, Hanvec


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=606&lang=en
France, Hanvec


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=606&lang=en
France, Hanvec


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=606&lang=en
France, Hanvec


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=606&lang=en
France, Hanvec


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=606&lang=en
France, Hanvec


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=606&lang=en
France, Hanvec


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=606&lang=en
France, Hanvec