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Stigmidium tetrasporum Etayo

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 Data set author(s): Cáceres M. Data set not revised; not to be published after submission.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: Etayo J., Candollea 49: 245-249 (1994).

Biogeography: Mediterranean, subalpine and alpine. Continent: Europe. Region(s): South-western Europe. Country or state(s): Spain (incl. Andorra & Monaco).

Ecology: Biotroph; lichenicolous; growing on calciferous rock. Host or Phorophyte Taxonomy: Verrucaria? sp.

Thallus: Indistinct.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, subglobose (broadly conical), forming inside the thallus or mycelium of the host, soon sessile, moderately abundant (in groups of 25-40 ascomata), 80-150 µm wide, with a pale black surface. Wall: Complete. Margin: Pale black, homogenously pigmented. Exciple: Paraplectenchymatous; pale black. Hymenium: Gelatinized, iodine reaction: Lugol’s negative, not hemiamyloid. Hypothecium: Pale black.

Asci: Obclavate, 27-34 µm long, 9-10 µm wide; ocular chamber present; dehiscence bitunicate; ascoplasm dextrinoid.

Ascospores: c. 4 per ascus, spores 4 per ascus, ellipsoid, 13-14 µm long, 4-5 µm wide, obtuse; septa present, transversally septate, 1-transversally septate; lumina of equal size; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiomata: Absent resp. not observed.

(report generated 04.Okt.2007)

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