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 and lower cortex paraplectenchymatous; 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; paraphyses absent, substituted by periphyses. Asci 8-spored, clavate, 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, biseriately arranged in the asci. 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:


Solar irradiation:








Altitudinal distribution:


Predictive model

Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum -
Austria, Kammspitz

Walter Obermayer CC BY-SA 4.0 - Source: Lichens of Noricum -
Austria, Kammspitz

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)

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