ITALIC 8.0

Rinodina isidioides (Borrer) H. Olivier

Mém. Soc. Nat. Sc. Nat. Cherbourg, 37: 186, 1909. Basionym: Parmelia isidioides Borrer in Hooker & Sowerby - Suppl. Engl. Bot., 3: tab. 2808, 1843.

Synonyms:

Distribution: C - Tosc.

Description: Thallus crustose, episubstratic, whitish or grey-white, appearing subfruticose, as it almost entirely consists of numerous, slender, cylindrical-coralloid, up to 0.3-0.4 mm long and c. 0.1 mm thick isidia which are often brownish at top. Apothecia lecanorine, scattered, sessile, (0.5-)0.7-1 mm across, with a brown to blackish brown, concave to flat disc, and a thick, entire, crenulate or isidiate, persistent thalline margin. Thalline exciple 70-110 μm wide laterally, corticate; proper exciple colourless, thin, expanding in upper part; epithecium pale orange- brown; hymenium colourless, 100-150 μm high; paraphyses coherent, 2-3 μm thick at mid-level, the apical cells 3-4 μm wide; hypothecium colourless. Asci 8-spored, clavate, the K/I+ blue tholus penetrated by a faintly amyloid apical cushion with parallel or diverging flanks, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores 1-septate, brown, ellipsoid, (17-)20–30(-34) x (10-)12-16(-18) μm, Pachysporaria-type, with a well-developed torus and ontogeny of type A (apical wall thickening after the early septum formation). Photobiont chlorococcoid. Spot tests: thallus K+ yellow, C-, KC-, P- or P+ faintly yellow. Chemistry: cortex with atranorin, medulla with variable amounts of zeorin.

Note: a mild-temperate, Mediterranean-Atlantic species found on rough bark, more rarely on epiphytic mosses in ancient, undisturbed forests. It is included as “Critically Endangered” in the Italian red list of epiphytic lichens (Nascimbene & al. 2013c).

Growth form: Crustose

Substrata: bark

Photobiont: green algae other than Trentepohlia

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

Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: extremely 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

P.L. Nimis CC BY-SA 4.0

TSB 16202

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (16202)
2003/03/17