ITALIC 8.0

Rinodina parasitica H. Mayrhofer & Poelt

Bibl. Lichenol., 12: 137, 1979.

Synonyms: Rinodina milvina var. amphibolitica Räsänen

Distribution: N - Frl (Tretiach & Hafellner 2000), VA (TO 1814). C - Sar.

Description: Thallus crustose, episubstratic, rather thick, at first of contiguous, 0.1-0.2 mm wide granules, finally areolate-verrucose, sometimes delimited by a dark prothallus, the areoles up to 0.6-0.7 mm wide, grey-brown to usually dark reddish brown, dull. Apothecia lecanorine, abundant and often confluent, innate to sessile, 0.3-0.5(-0.7) mm across, with a dark brown to black, flat to convex disc, and a thick, prominent, smooth to crenulate thalline margin; a raised excipular ring is sometimes visible between disc and thalline margin. Thalline exciple 40-90 µm wide laterally, corticate; proper exciple colourless, 5-15 µm wide laterally, expanding to (10-)20-40 µm in upper part; epithecium reddish brown; hymenium colourless, 70-100 µm high; paraphyses 1.5-2(-3) µm thick, the apical cells to 4-6 µm wide, immersed in a diffuse pigment; hypothecium colourless, 50-90 µm high. 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, broadly ellipsoid, (14-)16-18(-21) x (7-)8-10(-11) µm, Physcia-type, sometimes becoming thin-walled (Physconia-like), with ornamented walls and thickened apical walls, the ontogeny of type A (apical wall thickening after septum formation). Pycnidia black, immersed in thallus. Conidia bacilliform, 3.5-4.5 µm long. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: an arctic-alpine species found on siliceous rocks in upland areas, often growing on the thalli of other crustose lichens; easy to overlook and certainly more widespread, at least in the Alps.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

paras crustose lichens

Commonnes-rarity: (info)

Alpine belt: extremely rare

Subalpine belt: very rare

Oromediterranean belt: very rare

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

P.L. Nimis CC BY-SA 4.0

TSB 26484

Courtesy Philippe Blaise - Source: https://likenoj.ch/index.php/samples/865

Courtesy Philippe Blaise - Source: https://likenoj.ch/index.php/samples/865

Courtesy Philippe Blaise - Source: https://likenoj.ch/index.php/samples/865