ITALIC 8.0

Thelocarpon olivaceum B. de Lesd.

Rech. Lich. Dunkerque ,1 (suppl.): 149, 1914

Synonyms:

Distribution:

Description: Thallus crustose, reduced to small, scattered, 0.15-0.27 mm wide and 0.12-0.17 mm tall fruiting warts which are entirely bright yellow-pruinose or more rarely grey to brown and yellow-pruinose only at apex. Ascocarps frequent, perithecioid, fully immersed in the warts, with a concave, not exposed disc (the warts opening though a small pore). Exciple colourless, 6-12 μm thick, with an algal sheath, the outermost part free of algae, 6-12 μm thick, pseudocorticate; hymenial gel I- or I+ red, K/I+ blue; paraphyses absent; periphyses branched, easily detached, 20-25 μm long, arranged around the ostiole and on the sides. Asci many-spored, flask-shaped, tapering to apex, persistent, thin-walled, the wall I+ pale blue, not thickened at apex. Ascospores 1-celled, hyaline, oblong-ellipsoid to rarely subglobose, thin-walled, not constricted in the middle, (2-)2.5–3.5(-4) x 1.5–2 μm. Pycnidia located in the algal sheath of the fruiting warts, globose, c. 35 μm wide, the wall colourless. Conidia 4.5-5 x c. 1 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-. Chemistry: yellow pruina with pulvinic acid derivatives.

Note: an ephemeral, pioneer lichen found on a wide variety of usually disturbed substrata (bricks and roofing tiles, recently exposed rocks, soil, even leather), rare throughout Europe, with a single record from the Eastern Alps (Austria). To be looked for in Italy.

Growth form: Crustose

Substrata: rocks, bark, and lignum

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Pioneer species

pH of the substrata:

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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

Felix Schumm - CC BY-SA 4.0

[19389], Germany, Nordrhein-Westfalen, Niederrheinisches Tiefland, Düsseldorf-Hamm, Rheinufer, auf Sandsteinchen, 37 m. MTB 4706/3. Leg. et det. Dieter Gregor Zimmermann 1.1.2016

Felix Schumm - CC BY-SA 4.0

[19389], Germany, Nordrhein-Westfalen, Niederrheinisches Tiefland, Düsseldorf-Hamm, Rheinufer, auf Sandsteinchen, 37 m. MTB 4706/3. Leg. et det. Dieter Gregor Zimmermann 1.1.2016