ITALIC 8.0

Heteroplacidium compactum (A. Massal.) Gueidan & Cl. Roux

Bull. Inf. Ass. Franç. Lichén., 33, 1: 25, 2008. Basionym: Placidium compactum A. Massal. - Miscell. Lichenol.: 32, 1856.

Synonyms: Catapyrenium compactum (A. Massal.) R. Sant.; Dermatocarpon compactum (A. Massal.) Lettau; Dermatocarpon compactum var. eurysporum Lettau; Dermatocarpon crassulum (Müll. Arg.) Zahlbr.; Endopyrenium crassulum Müll. Arg.; Rhodocarpon compactum (A. Massal.) Lönnr.; Verrucaria compacta (A. Massal.) Jatta

Distribution: N - VG, TAA (Spitale & Nascimbene 2012, Nascimbene & al. 2022), Piem (Isocrono & al. 2004), Lig (Breuss 1994). C - Sar (Breuss 1994). S - Si.

Description: Thallus crustose-areolate to subsquamulose, medium to usually dark brown, smooth, dull. Areoles at first angular, then rounded, flat to slightly convex, to 4 mm wide and to 0.6 mm thick, sometimes sublobate and partly overlapping, constricted at base to form short peg-like projections composed of vertically oriented hyphae. Upper cortex paraplectenchymatous, of 5-8 µm wide cells, 10-25 µm thick, with a brown uppermost layer overlain by an up to 20 µm thick epinecral layer; medulla white, paraplectenchymatous; lower cortex absent. Perithecia immersed, 0.25-0.4 mm across, without involucrellum; exciple subglobose, colourless with only the apex brown-black, darkening throughout with age; hamathecium of periphyses and periphysoids, interascal filaments absent; hymenial gel hemiamyloid. Asci 8-spored, clavate, I-, fissitunicate, the wall thickened above, Verrucaria-type, 55-70 x 13-20 µm. Ascospores 1-celled, hyaline, broadly ellipsoid to subglobose, 13-18 x 8-10 µm, biseriately arranged in the asci. Pycnidia laminal, immersed, black, of the Dermatocarpon-type. Conidia bacilliform, 5-7 x c. 1.5 µm. Photobiont chlorococcoid (Myrmecia). Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: on more or less calcareous rocks, sometimes on other crustose lichens, but not parasitic, usually in upland areas but below treeline. This name probably includes several taxa related to H. fusculum, whose taxonomic status is in need of clarification.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: extremely rare

Oromediterranean belt: extremely 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:

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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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(info)

Poleotolerance:

0

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3

(info)

Altitudinal distribution:

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(info)

Predictive model

Herbarium samples

Index Fungorum GBIF

Curtis Randall Björk – CC BY-SA 4.0

Idaho, Butte County, Little Lost River Valley Date: 2012-05-08 Draped over Tsuga twigs on granite cliff near marine shore

Pier Luigi Nimis - CC BY-SA 4.0

Herbarium: TSB 32641