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Stigmidium degelii R. Sant.

Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. Data set not revised; not to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Stigmidium. Genus incertae sedis: Stigmidium; of unknown placement (incertae sedis).

Taxonomic Literature: Roux C. & Triebel D., Bull. Soc. Linn. Provence 45: 451-542 [489-492] (1994).

Biogeography: Northern hemispheric, coastal and colline. Continent: Europe. Region(s): Northern Europe, Middle Europe, and South-eastern Europe. Country or state(s): United Kingdom (Scottland and Ireland), Norway, Sweden, and Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia].

Ecology: Biotroph; lichenicolous, endosubstratic; growing on bark. Host or Phorophyte Taxonomy: Degelia atlantica, D. plumbea.

Thallus: Indistinct. Upper Surface: Brown (hyphae hialine to pale brown near ascomata).

Medulla: Iodine reaction in Lugol's solution positive (BCr+ intense blue violet).

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose or subglobose, forming inside the thallus or mycelium of the host, not emerging, becoming adnate, abundant, 50-90 µm wide, 55-105 µm high, with a black surface. Margin: Black, (5)-10-15 µm wide. Exciple: Paraplectenchymatous; hyphae 1-3.5 µm wide, 3.5-12 µm long, brownish red. Periphyses: Present. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed; cells 1.5-3 µm wide. Hypothecium: Brownish red (reddish brown).

Asci: Clavate or cylindrical, not stipitate, indistinctly stipitate (short-stalked), or distinctly stipitate, 30-57 µm long, 11-17 µm wide; tholus amyloid; ocular chamber present; dehiscence bitunicate; ascoplasm dextrinoid (BCr+ pale violet).

Ascospores: Not uniseriate, c. 8 per ascus, spores 8 per ascus, ellipsoid, (12)-13-15.4-17-(19.5) µm long, (3)-4-4.3-5-(6) µm wide, obtuse; septa present, transversally septate, 1-transversally septate; lumina apically enlarged, constricted at the centre (apical cell sometimes broader and basal longer); wall thin, laterally constricted where the septum meets the spore wall, remaining hyaline, hyaline, in Lugol's Solution positive (epispore BCr+ pale violet and perispore BCr+ intense blue), wall not ornamented or ornamented (finely verrucose).

Conidiomata: Present.

Conidia: Cylindrical; (3)-4-5-(5.5) µm long, 1-1.5 µm wide.

(report generated 04.Okt.2007)

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