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Polycoccum microcarpum Diederich & Etayo

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: Taxonomic notes: Species easily recognized by the formation of gall-likes swellings on
the squamules of Cladonia.
Etayo J. & Diederich P., Lichenologist 30(2) : 103-120 [111-112]

Biogeography: Northern hemispheric, montane. Continent: Europe. Region(s): South-western Europe. Country or state(s): United Kingdom and France (excl. Corsica).

Ecology: Biotroph; lichenicolous. Host or Phorophyte Taxonomy: Cladonia bellidiflora, C. cervicornis, C. digitata.

Thallus: Indistinct.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, subglobose, forming inside the thallus or mycelium of the host (on the squamules), not emerging (in convex galls on the squamules), abundant (arrising by groups of 20-80), small, 30-60-(100) µm wide, with a brown (dark brown at maturity) surface. Wall: Complete. Margin: Brown, 6-9 µm wide; external filaments absent. Exciple: Hyphae 2-4 µm wide; brown. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed; cells 1.5-2 µm wide. Hypothecium: Brown (assumed).

Asci: Clavate (elongate-clavate), 30-35 µm long, 15 µm wide; tholus not amyloid; ocular chamber present; dehiscence bitunicate; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, spores 8 per ascus, ovoid, 12-14.5 µm long, 4.5-7 µm wide; septa present; transversally septate, 1-transversally septate; lumina apically enlarged, constricted at the centre; wall laterally constricted where the septum meets the spore wall (slightly constricted), becoming pigmented, middle brown.

Conidiomata: Absent resp. not observed.

(report generated 04.Okt.2007)

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