Stigmidium marinum (Deakin) Swinscow

Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. (03-03-27). Data set not revised; not to be published after submission.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: Swinscow T. D. V., Lichenologist 3:55-64 [62] (1965).

Biogeography: Northern hemispheric, coastal (marine). Continent: Europe. Region(s): Northern Europe. Country or state(s): United Kingdom.

Ecology: Biotroph; lichenicolous, endosubstratic; growing on calciferous rock. Host or Phorophyte Taxonomy: Verrucaria microspora, V. mucosa.

Lichen Photobionts: Primary photobiont absent.

Thallus: Indistinct.

Medulla: Iodine reaction in Lugol's solution negative.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, subglobose, forming inside the thallus or mycelium of the host, not emerging, becoming adnate, 100-150 µm wide, with a black surface. Wall: Not carbonized. Margin: Black; external filaments absent. Disk: Smooth. Exciple: Not carbonized, pale brown or white. Periphyses: Absent. Hymenium: Gelatinized, iodine reaction: Lugol’s negative, not hemiamyloid.

Asci: Clavate (pyriform), indistinctly stipitate, 30-40 µm long, 10-15 µm wide; tholus not amyloid; ocular chamber present; broad; dehiscence bitunicate; exoascus not hemiamyloid; ascoplasm not dextrinoid.

Ascospores: Not uniseriate, c. 8 per ascus, spores 8 per ascus, ellipsoid or clavate, 10-15 µm long, 4-6 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, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)