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Stigmidium pseudopeltideae Cl. Roux & Triebel

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 Data set author(s): Cáceres M. Data set not revised; not to be published after submission.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 [503-504] (1994).

Biogeography: Northern hemispheric, subalpine and alpine. Continent: Europe. Region(s): Middle Europe. Country or state(s): Austria and Switzerland (incl. Liechtenstein).

Ecology: Biotroph; lichenicolous, endosubstratic. Host or Phorophyte Taxonomy: Peltigera aphtosa, P. didactyla.

Thallus: Indistinct. Upper Surface: Brown (vegetative hyphae medium brown).

Medulla: Iodine reaction in Lugol's solution positive (vegetative hyphae BCr+ dark blue to violet), strongly reacting.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose, forming inside the thallus or mycelium of the host, not emerging, becoming adnate, abundant, 90-100 µm wide, 90-100 µm high, with a black surface. Margin: Black, 5-11 µm wide. Exciple: Hyphae 1-3.5 µm wide, 3-12 µm long, dark brown. Periphyses: Present. Interascal Hyphae: Present, scarcely branched; cells 1.5-2 µm wide. Hypothecium: Black.

Asci: Clavate or cylindrical (rarely broadly subcylindrical), not stipitate (sometimes shortly stipitate), 24-35 µm long, 11-16 µm wide; dehiscence bitunicate (fissitunicate); ascoplasm not dextrinoid.

Ascospores: Not uniseriate, c. 8 per ascus, spores 8 per ascus, rarely ellipsoid or clavate (subclavate), (10)-10.5-12.4-14 µm long, 3.5-4.5-5.5-(6) µm wide, obtuse; septa present, transversally septate, 1-transversally septate; lumina of equal size or apically enlarged, constricted at the centre; wall thin, not constricted where the septum meets the spore wall, becoming pigmented, hyaline or pale brown (when old), in Lugol's Solution positive (external perispore BCr+ blueish), wall not ornamented or ornamented (internal perispore becoming brown and granulose).

Conidiomata: Absent resp. not observed.

(report generated 04.Okt.2007)

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