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Stigmidium epiphyllum 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 Data set author(s): Cáceres M. Data set not revised; not to be published after submission.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 [159-161] (1996).

Biogeography: Pantropical. Continent: Southern America and Asia-Tropical. Region(s): Eastern Asia, Mesoamerica, and Southern South America (dry and subtropical). Country or state(s): Peninsular Malaysia (= Malaya, Malaysia) and New Guinea (Papua New Guinea); Costa Rica and Southeastern Brazil (Brazil).

Ecology: Biotroph; lichenicolous; growing on living leaves. Host or Phorophyte Taxonomy: Actinoplaca vulgaris; Echinoplaca sp.

Thallus: Indistinct.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, ovoid (more or less broadly ovoid), forming inside the thallus or mycelium of the host, becoming adnate to soon sessile, sparse, 25-80 µm wide, 25-70 µm high, with a black surface. Margin: Olive, 3-20 µm wide. Exciple: Paraplectenchymatous; dark brown. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed; cells 1-2 µm wide. Hypothecium: Brown, olive, or brownish yellow.

Asci: Broadly clavate (saccate, ovoid, more rarely cylindrical), indistinctly stipitate or distinctly stipitate (sometimes broadly stipitate), 18-28 µm long, 11-15 µm wide; tholus not amyloid; ocular chamber present (distinct or not); dehiscence bitunicate (fissitunicate); exoascus not amyloid, not hemiamyloid; ascoplasm dextrinoid.

Ascospores: c. 8 per ascus, spores 5-8 per ascus, ellipsoid or obovoid, 8-9.6-11-(12) µm long, (2)-3-3.1-4 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 (slightly constricted at the septum), occasionally 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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