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Stigmidium trichotheliorum 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 Data set author(s): Cáceres M. Data set not revised; not to be published after submission.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 [164-166] (1996).

Biogeography: Neotropical, coastal, colline, and submontane. Continent: Southern America. Region(s): Mesoamerica. Country or state(s): Costa Rica.

Ecology: Biotroph; lichenicolous; growing on living leaves. Host or Phorophyte Taxonomy: Trichothelium alboatrum, T. epiphyllum var. epiphyllum.

Thallus: Indistinct.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose or subglobose, forming inside the thallus or mycelium of the host, soon sessile, 25-60 µm wide, 25-60 µm high, with a black or dark brown surface. Margin: Black or dark brown, inhomogenously pigmented, 3-13 µm wide. Exciple: Paraplectenchymatous; brown or dark brown. Periphyses: Present. Hymenium: Gelatinized, iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent (in mature ascomata). Hypothecium: Pale brown.

Asci: Cylindrical (cylindrical, elliptical, ovoid or saccate), distinctly stipitate, 20-34 µm long, 11-18 µm wide; tholus not amyloid; ocular chamber absent or present; exoascus not amyloid, not hemiamyloid; ascoplasm dextrinoid.

Ascospores: c. 8 per ascus, spores 4-8 per ascus, ellipsoid, 10-14.6-20 µm long, 3-3.6-5 µm wide, obtuse; septa present, transversally septate, 1-2-transversally septate; lumina more or less of equal size (primary septum supramedian tu submedian); wall thin, laterally constricted where the septum meets the spore wall, becoming pigmented, hyaline or pale brown, in Lugol's Solution negative, wall not ornamented or ornamented (light brown spores often finely scabrid).

Conidiomata: Absent resp. not observed.

(report generated 04.Okt.2007)

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