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Stigmidium porinae 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 Data set author(s): Cáceres M. Data set not revised; not to be published after submission.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 [161-163] (1996).

Biogeography: Pantropical. Continent: Australasia and Southern America. Region(s): Eastern Asia, Mesoamerica, and Southern South America (dry and subtropical). Country or state(s): Sumatra (Indonesia) (Java); Costa Rica and Southeastern Brazil (Brazil).

Ecology: Biotroph; lichenicolous; growing on living leaves. Host or Phorophyte Taxonomy: Porina epiphylla, P. lucida, P. sp.

Thallus: Indistinct.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose or ovoid, forming inside the thallus or mycelium of the host, becoming adnate, sparse, 35-75 µm wide, 40-60 µm high, with a black surface. Margin: Smooth, black, 5-12 µm wide; external filaments absent. Disk: Smooth. Exciple: Paraplectenchymatous; dark brown or brownish yellow. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed; cells 1-2 µm wide. Hypothecium: Dark brown or brownish yellow.

Asci: Cylindrical (saccate to cylindrical-saccate), distinctly stipitate (more or less stipitate), 19-30-(40) µm long, 8-12 µm wide; tholus widening towards apex, not amyloid; ocular chamber present; dehiscence bitunicate (fissitunicate); exoascus not amyloid, not hemiamyloid; ascoplasm not dextrinoid (endoascus CR+ orange) or dextrinoid.

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid, 8-9.8-12-(14) µm long, 2-2.6-3-(4) µm wide, obtuse; septa present, transversally septate, 1-3-transversally septate; lumina of equal size; wall thin, laterally constricted where the septum meets the spore wall, becoming pigmented, hyaline or pale brown (when over mature), in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed.

(report generated 04.Okt.2007)

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