ITALIC 8.0

Xylographa pallens (Nyl.) Malmgren

Not. Sällsk. Fauna Fl. Fenn. Förh., Ny Ser. 6: 84, 1861. Basionym: Xylographa parallela var. pallens Nyl. - Act. Soc. Linn. Bordeaux, 21: 393, 1857.

Synonyms:

Distribution: N - Ven (Nascimbene & al. 2021), TAA (Spribille & al. 2015), Lomb (Jatta 1909-1911).

Description: Thallus thin, of small, lens-like areoles, sometimes appearing rimose, scurfy, or granular, with 35-90 μm wide, corticate goniocysts. Apothecia linear, 0.5-2.8 x 0.09-0.33 mm, growing linearly in two to many directions, forming star-shaped clusters, with a flat to concave, pale to dark brown, matt disc, and a thin, brownish, finally excluded proper margin. Exciple of laterally interwoven hyphae, appearing paraplectenchymatous in vertical sections, 15-35(-50) μm wide, brown in outer part, colourless within; hymenium colourless to brown, 40-120 μm high, hemiamyloid, I+ blue-green turning rust-red; paraphyses slender, branched and anastomosing, 1.5-2 μm thick at mid-level, the apical cells 4-6 μm thick, continuing laterally in knot-like tangles over surface of disc, with brown wall pigments; hypothecium colourless, 80-140(-200) 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, (10-)12-16(-18.5) x 5-7.5(-10) μm. Pycnidia rare, formed in lines at the periphery of individual thalli, globular to cupular. Conidia filiform, curved, (10-)12–13(-18.5) x c. 0.5 μm. Photobiont chlorococcoid. Spot tests: thallus K+ yellowish (microscopic section!), C-, KC-, P+ yellow. Chemistry: stictic acid (major), norstictic acid (usually trace, rarely major), often with an unidentified fatty acid (trace).

Note: a widespread species in the Northern Hemisphere, growing on wood, especially in exposed habitats becoming dry in summer, mainly in montane to subalpine coniferous forests.

Growth form: Crustose

Substrata: lignum

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

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:

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

Index Fungorum GBIF

Curtis Randall Björk CC BY-SA 4.0

Idaho, Custer County, Red Hills. Lignicolous on Pseudotsuga logs in Juniperus-Pseudotsuga grove in high-elevation sagebrush steppe
2012-05-09

Curtis Randall Björk – CC BY-SA 4.0

Idaho, Custer County, Red Hills. Lignicolous on Pseudotsuga logs in Juniperus-Pseudotsuga grove in high-elevation sagebrush steppe 2012-05-09