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Stigmidium psorae (Anzi) Hafellner

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 Data set author(s): Cáceres M. Data set not revised; not to be published after submission.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: Triebel D., Biblioth. Lichenol. 35: 1-278 [83-84] (1989).

Biogeography: Northern hemispheric, alpine. Continent: Asia-Temperate, Europe, and Northern America. Region(s): Middle Europe, South-western Europe, Western Asia, and South-western U.S.A. Country or state(s): Austria, Germany, Switzerland (incl. Liechtenstein), France (excl. Corsica), Spain (incl. Andorra & Monaco), and Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia); Afghanistan; Arizona (USA).

Ecology: Biotroph; lichenicolous, endosubstratic. Host or Phorophyte Taxonomy: Psora crenata, P. decipiens.

Lichen Photobionts: Primary photobiont absent.

Thallus: Indistinct (vegetative hyphae hyaline).

Medulla: Iodine reaction in Lugol's solution negative.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose, forming inside the thallus or mycelium of the host, not emerging, becoming adnate to soon sessile, abundant, (100)-125-150-(200) µm wide, with a black surface. Wall: Not carbonized. Margin: Black, 10-20-(25) µm wide; external filaments absent. Exciple: Hyphae (2.5)-3.5-5 µm wide, 5-10.5 µm long, not carbonized, dark brown or dark brown. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed; cells 1-2-(2.5) µm wide. Hypothecium: Brown (middle to light brown).

Asci: Broadly clavate or broadly cylindrical, not stipitate or distinctly stipitate, 54-75-(80) µm long, 19-25 µm wide; tholus not amyloid; ocular chamber present (distinct in young asci); dehiscence bitunicate (fissitunicate); exoascus not amyloid, not hemiamyloid; ascoplasm not dextrinoid.

Ascospores: Not uniseriate (sometimes biseriate), c. 8 per ascus, spores 8 per ascus, ellipsoid, (16)-17.5-22-(23.5) µm long, (5)-5.5-7.5-(8) µm wide, obtuse; septa present, transversally septate, 1-transversally septate; lumina more or less of equal size; wall thin, laterally constricted where the septum meets the spore wall, becoming pigmented (old ascospores light brown), hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Present.

Conidia: Filiform; 3.5-5 µm long, 1 µm wide.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)

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