Stigmidium microcarpum Alstrup & J. C. David

Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. (03-03-04). Data set not revised; not to be published after submission.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: Alstrup V., Graphis Scripta 5(2): 96-104 [100] (1993).

Biogeography: Northern hemispheric. Continent: Europe. Region(s): Northern Europe. Country or state(s): Denmark; Greenland.

Ecology: Biotroph; lichenicolous, episubstratic; growing on inorganic soil. Host or Phorophyte Taxonomy: Cetraria cucullata.

Lichen Photobionts: Primary photobiont absent.

Thallus: Indistinct (vegetative hyphae brown).

Medulla: Iodine reaction in Lugol's solution negative.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose or subglobose, forming inside the thallus or mycelium of the host, becoming adnate, 35-50 µm wide, with a black surface. Wall: Not carbonized. Margin: Smooth, black, homogenously pigmented, 4-5 µm wide; external filaments absent. Disk: Smooth. Exciple: Paraplectenchymatous (textura angularis); hyphae (3)-4-5 µm wide, not carbonized, black. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present. Hypothecium: Black.

Asci: Cylindrical (obovate), 15-20 µm long, 5 µm wide; tholus amyloid; ocular chamber present; narrow; dehiscence bitunicate (fissitunicate); exoascus euamyloid; ascoplasm dextrinoid (endoascus I+ orange).

Ascospores: Not uniseriate (distichously arranged), c. 8 per ascus, spores 8 per ascus, ellipsoid (elongate) or oblong, 7-9 µm long, 2-3 µm wide, obtuse; septa present, transversally septate, 1-transversally septate; lumina of equal size; wall thin, not constricted where the septum meets the spore wall, remaining hyaline, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)