ITALIC 8.0

Phaeophyscia decolor (Kashiw.) Essl.

Mycotaxon, 7, 2: 299, 1978.. Basionym: Physcia decolor Kashiw. - Ginkgoana, 3: 42, 1975.

Synonyms:

Distribution: N - Frl (TSB 4495).

Description: Thallus foliose, heteromerous, dorsiventral, forming regular to irregular, up to 2-3(-4) cm wide rosettes, the lobes linear and discrete to crowded and overlapping, 0.1-0.5(-1) mm wide, flat to weakly convex, grey to brown, epruinose but sometimes with a patchy epinecral layer, rarely sparsely to richly lobulate; lower surface black, often brown at lobe-tips, with dense, concolorous, simple rhizines. Upper and lower cortex paraplectenchymatous; medulla white. Apothecia common, lecanorine, to 1 mm across, with a dark disc and an often crenulate or lobulate thalline margin, the lower side usually with a crown of dark rhizines. Epithecium brown; hymenium and hypothecium colourless; paraphyses slender, often forked in upper part, the apical cells clavate, with a thin dark cap. 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, 16-23(-27) x 8-10.5 µm, Physcia-type. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: medulla with zeorin.

Note: this silicicolous lichen has been considered by Moberg (1977) as a simple morph of Ph. endococcina with a medulla devoid of skyrin, while Esslinger (1978, 2004) considers it as a distinct species. European material of the two species needs a thorough study and sequencing. Ph. decolor seems to be widespread in the Alps, especially at low altitudes.

Growth form: Foliose, narrow lobed

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: rare

Submediterranean belt: very rare

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: absent

Dry mediterranean belt: absent

pH of the substrata:

1

2

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5

(info)

Solar irradiation:

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5

(info)

Aridity:

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5

(info)

Eutrophication:

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5

(info)

Poleotolerance:

0

1

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3

(info)

Altitudinal distribution:

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6

(info)

Predictive model

Curtis Randall Björk – CC BY-SA 4.0

British Columbia, Wells Gray Provincial Park Date: 2011-04-02 On basalt boulder in mixed conifer-deciduous forest