ITALIC 8.0

Rhizocarpon furfurosum H. Magn. & Poelt

in Poelt, Verh. zool.-bot. Ges. Wien, 95: 112, 1955.

Synonyms: Rhizocarpon obscuratum f. granulosum Schade

Distribution: N - Piem (TSB 33843). C - Sar.

Description: Thallus crustose, episubstratic, continuous to rimose, sometimes indistinctly areolate in marginal parts, blastidiate, ochre-brown to violet-grey, forming 1-3(-5) cm wide patches, sometimes delimited by a thin dark prothallus. Blastidia simple or sparingly branched, fragile, 0.02–0.04 mm thick and to 0.08 mm long, often slightly constricted at base. Apothecia very rare, black, lecideine, to 0.8 mm across, with a flat to weakly convex disc and a rather thick proper margin. Proper exciple dark brown in outer part, pale brown within, K+ yellow, with crystals partly dissolving in K; epithecium brown, K+ yellow, with crystals; hymenium colourless or pale yellowish brown, 80-100 μm high; paraphysoids strongly conglutinated, richly branched and anastomosing, sometimes slightly capitate; hypothecium dark brown, K-. Asci 8-spored, clavate, fissitunicate, with a well-developed tholus, lacking an ocular chamber, Rhizocarpon-type. Ascospores muriform, with 4-6 cells in optical view, hyaline, ellipsoid to narrowly ellipsoid, 14-27 x 7-12 μm. Photobiont chlorococcoid. Spot tests: medulla K+ yellow, C-, KC-, P+ orange. Chemistry : medulla and apothecia with stictic acid.

Note: on metal-rich siliceous rocks, mostly on steeply inclined to rain-sheltered faces in upland areas; easy to overlook, being mostly sterile, and to be looked for further in the Alps.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Species of metal-rich rocks

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: extremely rare

Oromediterranean belt: absent

Montane belt: very 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

Herbarium samples

Index Fungorum GBIF

Einar Timdal - Source: http://nhm2.uio.no/lav/web/index.html - CC BY-NC