ITALIC 8.0

Porpidia nigrocruenta (Anzi) Diederich & Sérus.

in Diederich & al., Dumortiera, 42: 28, 1988. Basionym: Lecidea nigrocruenta Anzi - Comm. Soc. Crittog. Ital., 2, 1: 18, 1864.

Synonyms: Huilia nigrocruenta (Anzi) Hertel; Porpidia macrocarpa f. nigrocruenta (Anzi) Fryday

Distribution: N - Piem.

Description: Thallus crustose, thinly episubstratic (rarely fully endosubstratic), continuous to rimose-areolate, whitish or pale grey, rarely ochre-coloured, sometimes delimited by a dark prothallus. Medulla white, I-. Apothecia lecideine, more or less round, often clustered in small groups, slightly constricted at base, 0.5-2(-2.5) mm across, with a black, flat to convex, sometimes slightly pruinose disc, and a persistent, usually entire, > 0.1 mm thick, raised proper margin. Proper exciple reddish brown to violaceous brown in outer part, slightly paler within, releasing a K+ crimson solution, with 3-9 µm wide hyphae; epithecium brown or olivaceous brown, K-, N+ orange; hymenium colourless, I+ blue, (70-)90-110(-130) µm high; paraphyses sparingly branched and anastomosing; hypothecium pale to usually dark brown. Asci 8-spored, elongate-clavate, with a thin, outer amyloid layer and a thickened tholus penetrated by a pore, the sides of which are strongly amyloid, Porpidia-type. Ascospores 1-celled, hyaline, ellipsoid, (14-)15-24(-28) x (5-)7-10(-13) µm. Photobiont chlorococcoid. Spot tests: thallus K- or K+ yellow, C-, KC-, P- or P+ orange. Chemistry: stictic acid (major), constictic and cryptostictic acids (all minor or trace), or no lichen substances.

Note: the status of silicicolous lichen described from Piemonte, which mainly differs from P. macrocarpa in the K+ crimson reaction of the exciple, is still debated: while some authors (e.g. Fryday & al. 2024) consider it as a form of P. macrocarpa, others (e.g. Jabłońska 2010) consider it as a distinct species.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: extremely rare

Oromediterranean belt: absent

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

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5

(info)

Solar irradiation:

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5

(info)

Aridity:

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3

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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

New York Botanical Garden (NY) – CC BY4.0 - Catalog #: 1050951 Leg. et Det. J. C. Lendemer Number: 14348 20 Sep 2008 - Canada, Ontario, Bruce Co., Bruce Peninsula National Park, along SE shore of Bartley Lake, along road to Halfway Log Dump, ca. 1.2 km SW of jct of Emmett Lake Road 45.2139 -81.3542 190 m, Thuja dominated forest on lake shore