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Polycoccum minutulum Kocourk. & F. Berger

Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. 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: Kocourková J. & Berger F., Czech Mycol. 51:171-177 (1999);
Kocourková J., Acta Mus. Nat. Pragae, Ser. B, Hist. Nat. 55(3-4): 59-169 [112] (1999-2000).

Biogeography: Northern hemispheric. Continent: Europe. Region(s): Middle Europe. Country or state(s): Austria and former Czechoslovakia (incl. Czech Republic & Slovacia) (Czech Republic).

Ecology: Biotroph; lichenicolous. Host or Phorophyte Taxonomy: Trapelia placodioides.

Thallus: Indistinct.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, obpyriform, forming inside the thallus or mycelium of the host (forming discoloured galls), not emerging, becoming adnate (when mature only the upper part exposed), abundant (arising singly or in groups of up to 20), small, (60)-70-120 µm wide, 90-130 µm high, with a black surface. Wall: Dimidiate (with about 3 layers). Margin: Lecanorine, black, 5 µm wide. Disk: Papillose (ostiolum somewhat papillose). Exciple: Paraplectenchymatous; dark brown (around the ostiole). Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed; cells 1-1.5 µm wide.

Asci: Distinctly stipitate (short stalked), 50-65 µm long, 14-17 µm wide; tholus not amyloid; exoascus hemiamyloid (asci content KI+ orange).

Ascospores: Not uniseriate (irregularly to distichously arranged), c. 8 per ascus, spores 8 per ascus, ellipsoid, (12)-13-16-(17) µm long, 5-6-(7) 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, ornamented (coarsely verruculose), distinctly halonate, i.e., with a thick mucilaginous sheath (gelatinous sheath 0,5-1,5 µm wide).

(report generated 04.Okt.2007)

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