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Polycoccum arnoldii (Hepp) D. Hawksw.

Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. (01.08.17). 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., Bot. Notiser 132: 289 (1979); Hawksworth D.L. &
Diederich P., Trans. Brit. Mycol. Soc. 90: 293-312 [296-297] (1988).

Biogeography: Montane. Continent: Europe and Southern America. Region(s): Northern Europe, Middle Europe, South-western Europe, South-eastern Europe, and Northern South America (Guyana) (Venezuela). Country or state(s): Denmark, United Kingdom, Germany, France (excl. Corsica), and Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia); Venezuelan Antilles (Venezuela).

Ecology: Biotroph; lichenicolous. Host or Phorophyte Taxonomy: Diploschistes cinereocaesius, D. scruposus; Rhizocarpum obscuratum, R. reductum;Tichothecium arnoldii.

Thallus: Indistinct.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, forming inside the thallus or mycelium of the host, within the ascocarp disks of the host, not emerging, 80 µm wide, 100 µm high. Wall: Complete. Margin: External filaments absent. Periphyses: Absent. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed; cells 1.5-2.5 µm wide.

Asci: Clavate (elongate), 35-50 µm long, 10-5 µm wide; dehiscence bitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid, 9-11.5-(13) µm long, 4.5-6.5-(7) µm wide, obtuse; septa present; transversally septate, 1-transversally septate; lumina apically enlarged, constricted at the centre; wall thin (smooth), laterally constricted where the septum meets the spore wall, becoming pigmented, middle brown, not ornamented (smooth).

Conidiomata: Absent resp. not observed.

(report generated 04.Okt.2007)

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