ITALIC 8.0

Phaeophyscia pusilloides (Zahlbr.) Essl.

Mycotaxon, 7: 313, 1978. Basionym: Physcia pusilloides Zahlbr. - Cat. Lich. Univ., 7: 678, 1931.

Synonyms: Physcia pusilla Mereschk.; Physcia suzai Nádv.

Distribution: N - VG (Carvalho 1997), Frl (Tretiach & Molaro 2007), Ven (Nascimbene 2008c, Nascimbene & Marini 2010), TAA (Nascimbene & al. 2021, 2022), Lomb (Rivellini 1994, Arosio & al. 2003), Piem (Isocrono & al. 2005b, Matteucci & al. 2010), VA (Isocrono & Ongaro 2021, Ravera & al. 2021b, Ongaro & al. 2022), Lig (Giordani & Brunialti 2000, Giordani & Incerti 2008). C - Tosc (Monaci & al. 1997), Marc (Nimis & Tretiach 1999), Laz (Zucconi & al. 2013), Abr (Nimis & Tretiach 1999, Caporale & al. 2016), Mol (Nimis & Tretiach 1999, Caporale & al. 2008, Paoli & al. 2015), Sar (Rizzi & al. 2011, Di Nuzzo & al. 2022). S - Pugl (Nimis & Tretiach 1999), Bas (Nimis & Tretiach 1999), Cal (Puntillo 1996).

Description: Thallus foliose, heteromerous, dorsiventral, narrow-lobed, forming orbicular to irregular, up to 2(-3) cm wide rosettes. Lobes elongate and discrete to partly imbricate, 0.3-1(-1.5) mm wide, flat, grey to grey-brown, epruinose, the main lobes branching into short lateral lobes bearing capitate soralia at the tips. Lower surface black, with simple, black rhizines. Upper and lower cortex paraplectenchymatous; medulla white Apothecia rare, lecanorine, to 3 mm across, the thalline margin sometimes with a corona of dark rhizines. Epithecium brown; hymenium and hypothecium colourless; paraphyses slender, often forked in upper part, the apical cells clavate, with a thin dark cap. Asci 8-spored, clavate, the K/I+ blue tholus penetrated by a faintly amyloid apical cushion with parallel or diverging flanks, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores 1-septate, brown, ellipsoid, 18-23(-25) x 7-11 µm, uniformly thick-walled, Physcia-type. Pycnidia immersed. Conidia ellipsoid. Photobiont chlorococcoid. Spot tests: all negative. Chemistry: without lichen substances.

Note: a temperate species found on isolated deciduous trees with nutrient-rich bark, especially Juglans and Fraxinus in montane valleys, absent from urban areas, somehow less frequent in semi-natural stands; often confused, in the past, with other species. The record from Rome by Munzi & al. (2007) needs confirmation.

Growth form: Foliose, narrow lobed

Substrata: bark

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: absent

Oromediterranean belt: absent

Montane belt: extremely rare

Submediterranean belt: very rare

Padanian area: absent

Humid submediterranean belt: rare

Humid mediterranean belt: absent

Dry mediterranean belt: absent

pH of the substrata:

1

2

3

4

5

(info)

Solar irradiation:

1

2

3

4

5

(info)

Aridity:

1

2

3

4

5

(info)

Eutrophication:

1

2

3

4

5

(info)

Poleotolerance:

0

1

2

3

(info)

Altitudinal distribution:

1

2

3

4

5

6

(info)

Predictive model

Herbarium samples

Index Fungorum GBIF

P.L.Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (12318)
2008.03.03

P.L.Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (12318)
2008.03.03

P.L.Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (12318)
2008.03.03

P.L.Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (36158)
2008.03.03