ITALIC 8.0

Rhizocarpon fratricida Poelt & Nimis

in Nimis & Poelt, Studia Geobot., 7, suppl. 1: 203, 1987.

Synonyms:

Distribution: C - Sar. S - Si.

Description: Thallus crustose, parasitic on the thalli of yellow Rhizocarpon-species, dark grey, areolate, forming 0.5-1 mm wide patches on the thalli of the host, several thalli often becoming confluent and forming larger patches; prothallus evident, grey, spreading on the areoles of the host. Areoles flat, more or less polygonal, with sharp edges, c. 0.5-1 mm wide, epruinose. Medulla white, I+ blue. Apothecia common, lecideine, black, round, dispersed or in groups at the margins of the areoles, totally or partially immersed, 0.3-0.7-(1) mm across, with a flat to slightly convex disc, soon immarginate. Exciple reduced, with more or less isodiametrical cells, purple to black; epithecium thick, purplish black, K+ purple; hymenium purplish, c. 150 μm high; hamathecium of strongly conglutinated, richly branched and anastomosing, apically clavate paraphysoids; hypothecium purplish black, K-. Asci (4-)8-spored, clavate, fissitunicate, with a well-developed tholus, lacking an ocular chamber, Rhizocarpon-type. Ascospores 1-septate, blackish grey-green, more or less ellipsoid, 14-23 x 7-9.5 μm, with a thick halo at least when young. Photobiont chlorococcoid, Spot tests: thallus K-, C-, KC-, P-. Chemistry: thallus without lichen substances.

Note: on siliceous rocks, starting the life-cycle on other yellow Rhizocarpon-species; probably more widespread in Southern Italy.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

paras yellow Rhizocarpon spp.

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: rare

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: rare

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

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