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Stigmidium schizosporum Matzer

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 Data set author(s): Cáceres M. Data set not revised; not to be published after submission.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: Matzer M., Mycol. Pap. 171: 0-202 [163-165] (1996).

Biogeography: Northern hemispheric. Continent: Australasia. Region(s): Australia. Country or state(s): Queensland (Australia).

Ecology: Biotroph; lichenicolous. Host or Phorophyte Taxonomy: Porina similis.

Thallus: Indistinct.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose or ovoid, forming inside the thallus or mycelium of the host, within the ascocarp margin of the host (on parts of the thallus which cover the host perithecia), becoming adnate, 50-75 µm wide, 40-60 µm high, with a black surface. Margin: Black, inhomogenously pigmented, 3-15 µm wide. Exciple: Paraplectenchymatous; dark brown or brownish yellow. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent or present (sparsely developed in mature ascomata), distinctly branched, distinctly anastomosed; cells 1-2 µm wide. Hypothecium: Dark brown or brownish yellow.

Asci: Globose or broadly clavate (saccate, ovoid to elliptical), indistinctly stipitate or distinctly stipitate (sometimes shortly stipitate), 20-27 µm long, 11-16 µm wide; tholus not amyloid; ocular chamber present; dehiscence bitunicate (fissitunicate); exoascus not amyloid, not hemiamyloid; ascoplasm dextrinoid (endoascus CR+ orange).

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid, 12-14.8-17-(18) µm long, 3-3.3-4 µm wide, obtuse; septa present, transversally septate, 1-(3)-transversally septate; lumina of equal size; wall thin, not constricted where the septum meets the spore wall or laterally constricted where the septum meets the spore wall, becoming pigmented, hyaline or pale brown, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed.

(report generated 04.Okt.2007)

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