ITALIC 8.0

Pilophorus cereolus (Ach.) Th. Fr.

Lichenogr. Scand., 1: 55, 1871. Basionym: Lichen cereolus Ach. - Lichenogr. Suec. Prodr.: 89, 1799.

Synonyms: Stereocaulon cereolinum Ach. non auct. ital.; Stereocaulon cereolum (Ach.) Ach.

Distribution: N - TAA (Nascimbene & al. 2022), Piem.

Description: Primary thallus crustose, persistent, of sorediate, 0.1-0.2 mm broad, grey-green to grey-brown granules, with scattered, brown to almost black, 1-2 mm wide cephalodia. Pseudopodetia simple, solid, to 6(-10) mm tall, 1-2(-5) mm thick in the middle, yhe sterile and pycnidiate ones thinner at the base and apex, farinose-sorediate throughout, often irregularly curved. Stalks composed of strongly gelatinized cells with narrow lumina. Apothecia biatorine, rare, solitary at tips of pseudopodetia, black, spherical, to 1.5 mm across. Proper exciple not developed; epithecium blackish brown, the pigment deposited between the terminal cells of the paraphyses; hymenium colourless to purplish, c. 80 μm high; hypothecium absent or very poorly developed. Asci 8-spored, elongate-clavate, with a thin, outer amyloid layer and a thickened tholus penetrated by a pore, the sides of which stain I/KI+ deep blue, Porpidia-type. Ascospores 1-celled, hyaline, spindle-shaped, 14-21 x 5-6.5 μm. Pycnidia bottle-shaped, black, on the tips of short pseudopodetia. Conidia sickle-shaped, hyaline, c. 5 x 1 μm. Photobiont chlorococcoid, Nostoc in the cephalodia. Spot tests: K+ yellow, C-, KC-, P-. Chemistry: atranorin and zeorin.

Note: an arctic-alpine, probably incompletely circumpolar lichen found on siliceous rocks in moist-wet situations near treeline; restricted to the Alps in Italy, and perhaps more widespread, but certainly not common.

Growth form: Fruticose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: extremely rare

Oromediterranean belt: absent

Montane belt: extremely 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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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

Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php

Triin Aimla; Owner: University of Tartu

Frey E. 1933. Cladoniaceae (unter Ausschluß ded Gattung Cladonia) und Umbilicariaceae. In: Rabenhrst’s Kryptogamenflora von Deutschland, Österreich und der Schweiz. 15: 1-208.