Stigmidium peltideae (Vain.) R. Sant.

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 Data set author(s): Cáceres M. Data set not revised; not to be published after submission.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: Roux C. & Triebel D., Bull. Soc. Linn. Provence 45: 451-542 [500-503] (1994).

Biogeography: Northern hemispheric. Continent: Europe. Region(s): Northern Europe, Middle Europe, and South-western Europe. Country or state(s): Finland, United Kingdom (Scottland), Norway, Sweden, Spain (incl. Andorra & Monaco), and Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia); Greenland.

Ecology: Biotroph; lichenicolous, endosubstratic. Host or Phorophyte Taxonomy: Peltigera aphtosa, P. canina, P. didactyla, P. leucophlebiae, P. membranacea, P. praetextata, P. rufescens, P. venosa.

Thallus: Indistinct. Upper Surface: Brown (vegetative hyphae pale brown to brown).

Medulla: Iodine reaction in Lugol's solution positive (vegetative hyphae strongly BCr+ blue violet).

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose, forming inside the thallus or mycelium of the host, not emerging, becoming adnate, moderately abundant, 45-65 µm wide, 50-70 µm high, with a black surface. Margin: Black, 5-10 µm wide. Disk: Smooth. Exciple: Hyphae 1-2.5 µm wide, (2)-4-9 µm long, dark brown. Periphyses: Present. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed; cells 1.5-2.5 µm wide. Hypothecium: Dark brown.

Asci: Clavate or cylindrical (broadly subcylindrical), not stipitate (sometimes shortly stipitate), 27-29 µm long, 9-11.5 µm wide; ocular chamber present; dehiscence bitunicate (fissitunicate); ascoplasm dextrinoid (endoascus BCr+ pale violet).

Ascospores: Not uniseriate, c. 8 per ascus, spores 8 per ascus, oblong-obtuse, broadly clavate, or oblong, (8.5)-9-10-11.5-(12) µm long, (2.5)-3-3.2-3.5-(4.5) µm wide, obtuse; septa present, transversally septate, 1-transversally septate; lumina of equal size or apically enlarged, constricted at the centre; wall thin, not constricted where the septum meets the spore wall, remaining hyaline, hyaline, in Lugol's Solution positive (epispore BCr+ pale violet), wall not ornamented, indistinctly halonate, i.e., mucilaginous sheath absent or thin.

Conidiomata: Absent resp. not observed.

(report generated 04.Okt.2007)