ITALIC 7.0

Verrucaria eusebii Servít

Stud. Bot. Cechosl., 11: 111, 1950.

Synonyms: Verrucaria amylacea Hepp nom. illegit. non Ach.

Distribution: N - Ven, Piem (Isocrono & al. 2004), Lig (Breuss 2008b). C - Tosc, Marc (Nimis & Tretiach 1999).

Description: Thallus crustose, thinly episubstratic, continuous or with a few inconspicuous cracks, pale grey, usually covered in a bluish-white, compact pruina, sometimes delimited by a dark prothalline line. Cortex overlain by a thick epinecral layer; medulla white, without a dark basal layer. Perithecia black, 0.2-0.3 mm across, c. 2/3 immersed in thallus, forming hemispherical projections, the ostiolar region often depressed. Involucrellum (40-)50-60 μm thick, adpressed to exciple and extending to base, becoming thinner downwards; exciple colourless or lightly pigmented in lower part; hamathecium of periphyses and periphysoids, interascal filaments absent; hymenial gel hemiamyloid, I+ red (I+ blue at very low concentrations of I), K/I + blue. Asci 8-spored, clavate, I-, fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of an endotunica to form a delicate rostrum, Verrucaria-type. Ascospores 1-celled, hyaline, ellipsoid, 15-20 x 6-8 μm, with a gelatinous perispore. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: on limestone and dolomite in sheltered situations protected from rain, e.g. with Leproplaca cirrochroa, perhaps overlooked, and more widespread. For further details see Breuss (2008b).

Growth form: Crustose endolithic

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

In underhangs rarely wetted by rain

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: rare

Submediterranean belt: rather rare

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

Herbarium samples

Index Fungorum GBIF

S. Poumarat - Source: http://mycologie.catalogne.free.fr/lichens.htm