Poeltinula cacuminum (Asta, Clauzade & Cl. Roux) Cl. Roux

Bull. Soc. linn. Provence, 54: 120, 2003. Basionym: Encephalographa cerebrina subsp. cacuminum Asta - Clauzade & Cl. Roux in Clauzade & Roux, Bull. Soc. linn. Provence, 30: 11, 1978.
Synonyms:
Description: Thallus crustose, mostly endosubstratic and poorly evident, rarely emiendosubtratic and white, continuous or rimose. Apothecia black, sessile, very variable in outline (rounded to polygonal), usually confluent, with a raised, sinuous margin and a disc soon provided with a ring-formed umbo, becoming strongly irregular by the confluence of several umbos. Proper exciple thick, dark reddish brown, K+ intensifying reddish; epithecium olive-grey or olive-brown, K-, N+ red; hymenium colourless, 50-80(-100) µm high, I+ blue; paraphyses 1.5-3 µm thick at mid-level, bifurcate in upper part and rarely anastomosing, the apical cells slightly swollen, to 5 µm thick, with a sharpply delimited dark cap; hypothecium dark reddish brown, extending down into a sort of peduncle which is 200-600 µm deep. Asci 8-spored, clavate, fissitunicate, with a well-developed, I+ pale blue tholus surrounded by a I+ blue gelatinous layer, lacking an ocular chamber, Rhizocarpon-type. Ascospores 1-septate, constricted at septum, at first hyaline but soon turning dark brown to violet-black (paler near septum, darker at both ends), N+ red, oblong-ellipsoid, (10-)12-16(-18) x 6-9(-10) µm, with a distinct epispore and a thin, sometimes poorly visible, colourless gelatinous sheath. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Growth form: Crustose
Substrata: rocks
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: rare
Subalpine belt: very rare
Montane belt: absent
Dry submediterranean belt: absent
Humid submediterranean belt: absent
Padanian area: absent

pH of the substrata:

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Poleotolerance:

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Altitudinal distribution:

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Rarity

absent
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common
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Occurrence data
Predictive map

Pier Luigi Nimis
Italy
TSB 37888


Pier Luigi Nimis
Italy
TSB 37888


Einar Timdal - Source: http://nhm2.uio.no/lav/web/index.html - CC BY-NC


Photo by E. Timdal. Source: Möller E.J., Timdal E., Haugan R., Bendiksby M. 2025. Integrative taxonomy and genus delimitation in the Rhizocarpaceae (lichenized Ascomycota). Fungal Syst. Evol., 16: 215-231. – CC BY-NC-ND
Austria, Wilfling & Möslinger 569, GZU Scale bars: G = 100 μm; H, I = 10 μm