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Polycoccum clauzadei Nav.-Ros. & Cl. Roux

Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. (02-02-13). 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: Navarro-Rosinés P. & Roux C., Mycotaxon 69: 327-337 (1998).

Biogeography: Northern hemispheric. Continent: Europe. Region(s): Middle Europe. Country or state(s): France (excl. Corsica).

Ecology: Biotroph; lichenicolous. Host or Phorophyte Taxonomy: Xanthoria elegans.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, subglobose or broadly ovoid, forming inside the thallus or mycelium of the host, not emerging, (110)-120-180 µm wide, (120)-140-190 µm high, with a dark brown surface. Margin: 15-25 µm wide. Exciple: Paraplectenchymatous. Hymenium: Iodine reaction: Lugol’s positive (reddish orange). Interascal Hyphae: Present, distinctly branched, distinctly anastomosed; cells 1.5-2 µm wide. Hypothecium: Dark brown.

Asci: Clavate (clavate to more or less elongate), distinctly stipitate (short stalked), (45)-50-70-(80) µm long, 13-15 µm wide; tholus not amyloid; ocular chamber present; narrow; dehiscence bitunicate; exoascus not hemiamyloid; ascoplasm dextrinoid (reddish orange).

Ascospores: Uniseriate, c. 8 per ascus, spores 4-6-(8) per ascus, globose, rarely ellipsoid, or obovoid, 15-16.4-18.5-(19.5) µm long, (6.5)-7-7.9-9-(9.5) µm wide, obtuse; septa present; transversally septate, 1-transversally septate; lumina apically enlarged, constricted at the centre; wall laterally constricted where the septum meets the spore wall, becoming pigmented, dark brown, ornamented (densely rugose to verruculose when mature), distinctly halonate, i.e., with a thick mucilaginous sheath.

(report generated 04.Okt.2007)

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