Nephroma tropicum (Müll. Arg.) Zahlbr.

Cat. Lich. Univ., 3: 442, 1925. Basionym: Nephromium tropicum Müll. Arg. - Flora, 66: 21, 1883
Synonyms: Nephroma helveticum subsp. sipeanum (Gyeln.) Goward & Ahti ; Nephroma helveticum var. sipeanum (Gyeln.) Wetmore; Nephroma sipeanum Gyeln.
Distribution: N - Ven (Timdal & al. 2021, Ravera & al. 2022).
Description: Thallus foliose, heteromerous, leathery, >0.20 mm thick, forming regular to irregular, 3-4(-8) cm wide rosettes, loosely adnate. Lobes 2-5 mm wide, elongate, with subrotund apices, the margins frequently toothed, the fertile lobes with obtuse teeth measuring 0.6-1 x c. 0.3 mm. Upper surface grey-brown to dark brown, smooth, finely pubescent, isidiate-phyllidiate. Isidia at first cylindrical, becoming flattened, 0.1-0.2 mm in diam., mostly marginal but later expanding on the upper surface. Medulla white. Lower surface dark brown to black, paler at margins, pubescent or tomentose, not papillate. Apothecia common, immersed on lower surface at tips of lobes, to 8 mm across, cup-shaped, sessile, with a brown disc and a distinct, uplifted margin, the dorsal surface smoothly ridged, without tomentum. Epithecium brownish; hymenium and hypothecium colourless. Asci 8-spored, fissitunicate, the thickened apex with a K/I+ blue ring, Peltigera-type. Ascospores 3-septate, pale brown, subfusiform, thick-walled, most of them 20-24 x 5.5-6 μm. Pycnidia immersed, punctiform, Conidia rod-shaped, 3-4 x 1-2 µm. Photobiont cyanobacterial (Nostoc). Spot tests: upper cortex K-, C-, KC-, P-; medulla K+ pale yellow or K-, C-, KC-, P-. Chemistry: upper cortex with an unknown brown pigment; medulla with peltidactylin and other terpenoids.
Note: an extremely rare species with tropical affinities, growing on the often mossy bark of deciduous trees in humid shaded situations. For further details see Timdal & al. (2021).
Growth form: Foliose, broad lobed
Substrata: bark
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly sexual
Restricted to humid-warm, oceanic areas

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: extremely 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


P.L. Nimis CC BY-SA 04
TSB 42289



P.L. Nimis CC BY-SA 04
TSB 42289