ITALIC 8.0

Aquacidia trachona (Ach.) Aptroot

in Aptroot & al., Gorteria, 40: 13, 2018.. Basionym: Verrucaria trachona Ach. - Meth. Lich. Suppl.: 16, 1803.

Synonyms: Bacidia trachona (Ach.) Lettau

Distribution: N - Lomb (Pistocchi & al. 2026).

Description: Thallus crustose thinly episubstratic, poorly developed to rimose, pale grey-green to brownish, minutely granular-warted. Apothecia often absent, biatorine, black, sessile, 0.2-0.5 mm across., with a flat disc and a thin proper margin. Proper exciple dark red-brown, K+ purple; epithecium dark green to olive-green, K-, N+ red; hymenium mostly colourless (pale red-brown below, pale green above), 40-50 μm high,; paraphyses contorted, often branched and anastomosing 1-1.5 μm thick, the apical cells to 2 μm wide; hypothecium dark red-brown, K+ purple. Asci 8-spored, Micarea-type. Ascospores (0-)3-septate, hyaline, fusiform, 11-17(-20) x 3-4.5(-5) μm. Pycnidia black, sessile, 0.1-0.3 mm across, the ostiole finally widely gaping, the wall dark brown, K+ purple. Conidia short-cylindrical, 3-5 x 1-1.5 μm. Photobiont chlorococcoid, the cells 5-12 μm wide. Spot tests: thallus K-, C-, KC-, P+ orange-red, UV-. Chemistry: thallus with argopsin; apothecia and pycnidial walls with anthraquinones

Note: a mostly sterile, pycnidiate species mainly growing on sheltered, often rain-protected surfaces of siliceous rocks in shaded and humid situations. There are several other records of Bacidia trachona from Italy (see Nimis 1993: 114), but according to Lop & Ekman (2004) the species has an oceanic distribution in Europe from Portugal to Scandinavia, whereas Mediterranean samples attributed to this taxon belong to T. coprodes.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual, or asexual by conidia and thalloconidia

Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

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:

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

Marko Doboš

Voćin, Croatia

Marko Doboš

Voćin, Croatia

Marko Doboš

Voćin, Croatia

Marko Doboš

Voćin, Croatia

Marko Doboš

Voćin, Croatia

United States National Herbarium - Smithsonian - CC BY-SA NC

Austria, Mt. Sonntagberg prope Rosenau. P. Strasser 697