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Stigmidium acetabuli Calat. & 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 Data set author(s): Cáceres M. Data set not revised; not to be published after submission.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: Calatayud, V. & Triebel, D, Biblioth. Lichenol. 78: 27-33 (2001).

Biogeography: Mediterranean. Continent: Europe. Region(s): South-western Europe. Country or state(s): France (excl. Corsica) and Spain (incl. Andorra & Monaco).

Ecology: Biotroph; lichenicolous, endosubstratic; growing on bark. Host or Phorophyte Taxonomy: Pleurosticta acetabulum.

Lichen Photobionts: Primary photobiont absent.

Thallus: Indistinct.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose or subglobose, within the ascocarp disks of the host, largely not emerging, 50-85 µm wide, with a black surface. Wall: Not carbonized. Margin: Black, inhomogenously pigmented, 5-7 µm wide; external filaments absent. Exciple: Paraplectenchymatous (textura angularis); hyphae 5-10 µm wide, not carbonized, brown. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Brown (pale brown to brown).

Asci: Clavate (or saccate), not stipitate, 20-30-(35) µm long, 9-11 µm wide; tholus not amyloid; ocular chamber present; indistinct or narrow; dehiscence bitunicate; exoascus not amyloid.

Ascospores: Not uniseriate (distichously arranged), c. 8 per ascus, spores 8 per ascus, oblong-obtuse, (7.5)-8-9.3-10.5-(11) µm long, (3)-3.6-4-(4.5) µm wide, obtuse; septa present, transversally septate, 1-transversally septate; lumina apically enlarged, constricted at the centre; wall thin, laterally constricted where the septum meets the spore wall, becoming pigmented, hyaline or pale brown (when mature), in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed (not observed).

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)

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