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Polycoccum marmoratum (Kremp.) D. Hawksw.

Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. (01-09-04). Data set reviewer(s): Triebel D.; revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Polycoccum. Dacampiaceae Körb. (1855); Dothideales.

Taxonomic Literature: Hawksworth D.L. & Diederich P., Trans. Brit. Mycol. Soc. 90: 293-
312 [302] (1988); Hawksworth D.L., P. James & Coppins B.J.,
Lichenologist 12: 1-115 [107] (1980).

Biogeography: Northern hemispheric. Continent: Europe. Region(s): Middle Europe, South-western Europe, South-eastern Europe, and East Europe. Country or state(s): United Kingdom, Austria, Germany, Poland, France (excl. Corsica), Spain (incl. Andorra & Monaco), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, and Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia].

Ecology: Biotroph; lichenicolous; growing on calciferous rock. Host or Phorophyte Taxonomy: On pyrenocarpous and crustose lichens on limestone.

Thallus: Indistinct.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, forming inside the thallus or mycelium of the host, not emerging, becoming adnate (almost superficial at maturity), (150)-200-250-(300) µm wide. Periphyses: Absent. Hymenium: Gelatinized, iodine reaction: Lugol’s positive (at least in parts). Interascal Hyphae: Present, distinctly branched, distinctly anastomosed; cells 2-2.5 µm wide.

Asci: Clavate (elongate), 50-90 µm long; dehiscence bitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, broadly ellipsoid, (20)-25-30-(36) µm long, 14-18 µm wide, obtuse; septa present; transversally septate, 1-transversally septate; lumina of equal size (and to 2/3 the length of the spore) or apically enlarged, constricted at the centre; wall dark brown, ornamented (coarsely verruculose).

(report generated 04.Okt.2007)

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