ITALIC 7.0

Opegrapha hellespontica Vondrák & Kocourk.

Lichenologist, 40: 175, 2008

Synonyms:

Distribution: C - Sar (Brackel & Berger 2019).

Description: Thallus inapparent, not lichenized, the hyphae developing inside the thalli of placodioid Variospora-species. Apothecia at first round, then lirelliform or ellipsoid, sessile, black, epruinose, (0.24-)0.3-0.5(-0.7) x (0.15-)0.2(0.3) mm, with a slit-like or slightly expanded disc, usually gathered into up to 1 mm wide, dense, suborbicular clusters. Proper exciple black, carbonized, (20-)30-70(-80) µm thick, formed of paraplectenchymatous cells, extending below the hymenium; epithecium covered in brown granules which are insoluble in K and in N, I+ blue; hymenium colourless, (80-)95-120(-130) µm high, I+ reddish, K/I+ blue; paraphysoids branched and anastomosing, 1.5-3 µm thick, the apical cells brown-pigmented, up to 5 µm wide; subhymenium colourless, 30-40 µm high, rarely inspersed with oil droplets; hypothecium brown-black, 20-30 µm high. Asci (6-)8-spored, narrowly clavate, fissitunicate, with a tholus and internal apical beak, Opegrapha-type. Ascospores 3-septate, hyaline (overmature spores may be brownish and warted), narrowly ellipsoid to slightly clavate, (14-)15-18(-19) x 5-7.5 µm, with a 0.5-1.5 µm thick, gelatinous perispore (not always observable). Photobiont absent. Spot tests: K-, C-, KC-, P-. Chemistry: without lichen substances.

Note: a recently-described lichenicolous fungus growing on the thalli of placodioid Variospora- species, known from a few sites in the Mediterranean Region.

Growth form: Lichenicolous fungus

Substrata: rocks

Reproductive strategy: mainly sexual

paras Variospora flavescens

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: extremely rare

Padanian area: absent

Humid submediterranean belt: extremely rare

Humid mediterranean belt: very rare

Dry mediterranean belt: very rare

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

Wolfgang von Brackel

Italy, Sardinia, OG, Barbagia Seulo, between Seui and Ussussai, on the road to Monte Tonneri, limestone rock on the forest edge, 970 m
14.08.2014
A – infection on the thallus of Variospora flavescens in the zone between the vanished inner parts (left down) and the healthy outer parts (right above); B: agglomeration of lirelloid and ellipsoid ascomata on a gall-like structure. Scale bar A = 2 mm, B = 0.5 mm