Aspicilia glomerulans (Poelt) Poelt

Mitt. bot. Staatss. München, 8: 202, 1970. Basionym: Lecanora glomerulans Poelt - Mitt. bot. Staatss. München, 4: 177, 1961.
Synonyms:
Distribution: C - Sar.
Description: Thallus crustose, episubstratic, areolate, greenish grey to yellowish grey, delimited by a thin, black prothallus, forming several cm wide patches. Cortex paraplectenchymatous, 30-40 µm thick, overlain with an epinecral layer which is particularly thick in the apical parts of isidia; algal layer 40-70 µm thick; medulla white, rather lax, I-. Areoles angular-acute, up to 1 mm wide, completely covered in 1-2 mm tall, papilliform, terete, up to 1 mm wide, often branched, apically widened and flattened isidia with minutely verrucolose and often darker apices, forming distinct glomerules. Apothecia very rare, aspicilioid, 0.3-0.7 mm across, round to irregular in outline, with a black, epruinose disc and a thin thalline margin. Epithecium grey-green to olive-brown, N+ emerald green; hymenium colourless, I+ persistently blue; paraphyses not or slightly branched and anastomosing; hypothecium colourless, not subtended by an algal layer. Asci 8-spored, clavate, the thin outer coat K/I+ blue, the wall and apical dome K/I-. Ascospores 1-celled, hyaline, ellipsoid, 16-19 x 6-12 μm . Pycnidia black, immersed in the thallus. Conidia hyaline, thread-like, 13-19 x 0.7-1 µm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a rarely-collected lichen found on siliceous boulders along streams, mostly above treeline, described from the Central Alps; probably overlooked being often sterile with coarse, partly branched, apically flattened isidia; to be looked for also in the Italian Alps.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by isidia, or isidia-like structures (e.g. schizidia)
Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: extremely rare
Subalpine belt: absent
Oromediterranean belt: very rare
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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Poelt J. - Mitteilungen bot. Staatssammlung München 4, 1957.