Myriospora rhagadiza (Nyl.) K. Knudsen & Arcadia

Myriospora rhagadiza (Nyl.) K. Knudsen & Arcadia

in Arcadia & Knudsen, Opuscula Philolich., 11: 22, 2012. Basionym: Lecanora rhagadiza Nyl. - Flora, 64: 1881.

Synonyms: Acarospora scyphulifera Vain.; Acarospora smaragdula subsp. smaragdula var. scyphulifera (Vain.) Clauzade & Cl. Roux; Acarospora smaragdula var. rhagadiza (Nyl.) Clauzade & Cl. Roux; Silobia rhagadiza (Nyl.) M. Westb.

Distribution: S - Camp (Westberg & al. 2011).

Description: Thallus crustose, episubstratic, areolate, the areoles irregular to angular in outline, contiguous or sometimes dispersed, separated by broad cracks; fertile areoles 0.7-1.5 (-2) mm wide, dirty greyish brown, dark brown or pale rust-red, dull, epruinose, usually flat, sometimes convex or with slightly upturned margins. Epicortex absent or very thin; cortex paraplectenchymatous, 15-35 μm thick, of 2-5 μm wide, isodiametric cells, the uppermost ones with red-brown to dark brown walls, without crystals; algal layer interrupted by thick anticlinal bundles of medullary hyphae; lower cortex absent. Apothecia cryptolecanorine, 0.15-0.55(-0.65) mm across, immersed, 1-4 (-6) per areole; with a reddish brown to brown (reddish when wet), smooth, epruinose disc surrounded by a distinct, slightly raised, pale brown to blackish parathecial margin, the thalline margin poorly developed. Proper exciple colourless, but uppermost cells with dark brown caps; epithecium yellow-brown to dark red-brown; hymenium colourless, 110–160 μm high; paraphyses sparingly branched and anastomosing, 1-2 μm thick, the apical cells cylindrical to clavate; subhymenium 50-75 μm high, colourless to greyish or yellowish, densely inspersed with oil droplets. Asci 100-200-spored, clavate, the apical dome K/I-, c. 105 x 21 μm. Ascospores 1-celled, hyaline, ellipsoid, 2.5-3 x 1–1.5 μm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: optimum on basic siliceous rocks, usually not far from the coasts; a very variable, mainly western species in Europe, also reported from Mt. Vesuvius.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

In underhangs rarely wetted by rain

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

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

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Argol, Lomergat

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Rostellec

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

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Rostellec

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Rostellec

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Argol, Lomergat

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Rostellec

Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Rostellec

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Argol, Lomergat

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Argol, Lomergat

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Argol, Lomergat

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Argol, Lomergat

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Argol, Lomergat

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Argol, Lomergat

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Argol, Lomergat

Jacques Haine - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1028&lang=en

France, Argol, Lomergat

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