Arthonia follmanniana Diederich

Flechten Follmann, Contributions to Lichenology in Honour of Gerhard Follmann (Cologne): 180, 1995.
Synonyms:
Distribution:
Description: Thallus inapparent, not lichenized, developing inside the thalli of Roccella-species. Apothecia arthonioid, black, sometimes bluish-pruinose, at first more or less immersed in the thallus of the host, becoming sessile, 0.1-0.3 mm across, mainly located on the tips of branches of the host thallus. Epithecium dark olivaceous to almost black; hymenium colourless, c. 25 μm high, I+ red, K/I+ blue; paraphysoids branched and anastomosing; hypothecium pale to dark brown. Asci 8-spored clavate, semi-fissitunicate, with a large apical dome, and a distinct ocular chamber. Ascospores 2-3-septate, hyaline, narrowly soleiform, mostly with a wide and shorter upper cell and narrower and longer lower cell, 10-12(-13.5) x 3−4.5(−5) μm. Photobiont absent. Spot tests: K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a lichenicolous fungus growing on the thalli of Roccella-species, described from the Galapagos Islands, and later found also in Macaronesia and in the Mediterranean region; to be looked for in Italy.
Growth form: Lichenicolous fungus
Substrata: rocks
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)
paars Roccella-species
Taxon bound to maritime-coastal situations



pH of the substrata:

(info)

1

2

3

4

5

Solar irradiation:

(info)

1

2

3

4

5

Aridity:

(info)

1

2

3

4

5

Eutrophication:

(info)

1

2

3

4

5

Altitudinal distribution:

(info)

1

2

3

4

5