Involucropyrenium waltheri (Kremp.) Breuss

Ann. naturhist. Mus. Wien, 98B: 40, 1996. Basionym: Verrucaria waltheri Kremp. - Flora, 38: 69, 1855.
Synonyms: Catapyrenium waltheri (Kremp.) Körb.; Dermatocarpon waltheri (Kremp.) Blomb. & Forssell
Distribution: N - TAA, Piem (Isocrono & al. 2004), Lig.
Description: Thallus squamulose to subcrustose, brownish, sometimes with a grey tinge, dull, thin. Squamules <1.5 mm broad and long, usually contiguous and forming a crust, flattened to slightly convex, smooth, irregular in shape, the margins entire to usually crenate-lobulate, not up-turned, surrounded by a dark hypothallus, the marginal squamules often somehow elongate. Lower surface dark, attached by 4-5 µm thick, dark rhizohyphae. Upper cortex paraplectenchymatous, of small isodiametrical cells, rather thin, poorly differentiated from the algal layer; lower cortex paraplectenchymatous, of polygonal cells; medulla not differentiated. Perithecia frequent, developing on a dark hypothallus among the squamules, globose, projecting, with an involucrellum extending all around the perithecium, 0.2-0.35 mm across. Exciple black and carbonaceous throughout, of tangentially arranged, elongated cells; hamathecium of periphyses, interascal filaments absent. Asci 8-spored, clavate, with biseriately arranged spores, the wall I-. Ascospores 1-celled, hyaline, narrowly ovoid to club-shaped, thin-walled, (15-)17-21(-23) x (7.5-)8-10(-11) µm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P- UV-. Chemistry: without lichen substances.
Note: on calciferous, humus-rich soil in alpine grasslands, probably more widespread in the Alps.
Growth form: Squamulose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: extremely rare
Oromediterranean belt: absent
Montane belt: absent
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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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Index Fungorum GBIF

Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/
Austria, Kammspitz
2015


Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum - http://lichens-of-noricum.uni-graz.at/
Austria, Kammspitz
2015



P.L. Nimis CC BY-SA 4.0
GZU (Ref.Herb.Poelt 5177)



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: GZU (Ref.Herb.Poelt 5177)
2003/04/28



P.L. Nimis CC BY-SA 04
GZU (82-96)