ITALIC 8.0

Rhizocarpon tetrasporum Runemark

Opera Bot., 2: 86, 1956.

Synonyms:

Distribution: N - Piem (Morisi & Sereno 1995, Gheza & Nascimbene 2024), VA (Piervittori & Isocrono 1999). C - Sar. S - Camp (Aprile & al. 2002).

Description: Thallus crustose, episubstratic, greenish yellow, areolate, forming 3-6 cm wide patches, delimited by a black prothallus. Areoles contiguous, 0.5-1.2 mm wide, round to angular, flat to slightly convex, often verrucose. Cortex c. 35 µm thick; medulla white, I-. Apothecia lecideine, black, 0.6-1.2 mm across, round, with a flat to strongly convex disc and an initially thick, finally often excluded proper margin. Proper exciple brownish in outer part, K+ red-brown; epithecium with blackish granules, K+ greenish; hymenium colourless in lower part, greenish in upper part, 100-150 µm high; hamathecium of paraphysoids, strongly conglutinate, richly branched and anastomosing, the apical cells clavate. Asci (2-)4(-6)-spored, clavate, fissitunicate, with a well-developed tholus, lacking an ocular chamber, Rhizocarpon-type. Ascospores muriform, soon becoming dark green to brown, ellipsoid, 27-40 x 14-21 µm, halonate. Photobiont chlorococcoid. Spot tests: medulla K+ yellow, C-, KC-, P+ brick red. Chemistry: cortex with rhizocarpic acid, medulla with stictic acid.

Note: on siliceous rocks in the mountains. Closely related to Rh. viridiatrum and Rh. oportense, this species is worthy of further study.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: very rare

Subalpine belt: very rare

Oromediterranean belt: extremely rare

Montane belt: very rare

Submediterranean belt: extremely 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

Index Fungorum GBIF