ITALIC 8.0

Xylographa trunciseda (Th. Fr.) Redinger

Minks ex Redinger, Rabenh. Krypt.-Flora, 9, 2, 1: 216, 1938. Basionym: Lecidea trunciseda Th. Fr. - Lichenogr. Scand., 1: 467, 1874.

Synonyms:

Distribution: N - TAA (Nimis & al. 2015, Nascimbene & al. 2022). S - Cal (Puntillo 1996).

Description: Thallus crustose, endosubstratic, with corticate, 10-40 μm wide goniocysts. Apothecia rugby-ball shaped (roundish to narrowly elliptical), often regenerating in chains from the outer tips of empty excipular shells, 0.2-3.9 x 0.09-0.24 mm, with a concave to flat, pale to dark brown disc, and a thin, brown, inconspicuous margin. Exciple of laterally interwoven hyphae, paraplectenchymatous in vertical section, 20-45(-67) μm wide, pale brown in outer part, colourless within; hymenium colourless to pale brown, easily separating from exciple, 60-85 μm high, I+ blue-green, then rust red; paraphyses slender, sparsely branched, 1.2-2 μm thick at midpoint, apically thickened to 3.5 μm, the apical cells sprawling over the disc; hypothecium colourless, 30-50(-70) μm high. Asci 8-spored, clavate-cylindrical, unitunicate, the gelatinous sheaths covering the walls amyloid, the tholus lacking internal amyloid structures, similar to that in Trapelia. Ascospores 1-celled, hyaline, ellipsoid, (8.5-)10-11(-13) x 4.5-7 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-. Chemistry: confriesiic acid, or without lichen substances.

Note: on rotting wood, mostly of conifers, usually in the montane and subalpine belts; certainly more widespread in the Alps. It is included in the Italian red list of epiphytic lichens as “Data Deficient” (Nascimbene & al. 2013c).

Growth form: Crustose

Substrata: lignum

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: very rare

Oromediterranean belt: absent

Montane belt: very rare

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: absent

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

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6

(info)

Predictive model

Herbarium samples

Index Fungorum GBIF

Leif Stridvall http://www.stridvall.se/la/galleries.php (Courtesy: Anita Stridvall)

P.L. Nimis CC BY-SA 4.0

TSB 8265

Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php (Courtesy: Anita Stridvall)