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Stigmidium pumilum (Lettau) Matzer & Hafellner

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 Data set author(s): Cáceres M. Data set not revised; not to be published after submission.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).

Type Information: Basionym: Rosellinia pumila Lettau.

Taxonomic Literature: Matzer M. & Hafellner J., Biblioth. Lichenol. 37: 1-138 [115-120] (1990).

Biogeography: Subalpine and alpine. Continent: Australasia and Europe. Region(s): Northern Europe, Middle Europe, South-western Europe, and New Zealand. Country or state(s): Sweden, Austria, Switzerland (incl. Liechtenstein), and France (excl. Corsica); Canary Islands (Spain); North Island of New Zealand.

Ecology: Biotroph; lichenicolous, endosubstratic; growing on calciferous rock. Host or Phorophyte Taxonomy: Physcia caesia, Ph. caesia var. rhaetica, Ph. dubia.

Lichen Photobionts: Primary photobiont absent.

Thallus: Indistinct (vegetative hyphae brown).

Medulla: Iodine reaction in Lugol's solution negative.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose or ovoid, forming inside the thallus or mycelium of the host, not emerging, 30-80 µm wide, 40-70 µm high, with a black surface. Wall: Not carbonized. Margin: 3-30 µm wide; external filaments absent. Exciple: Not carbonized, dark brown. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative. Interascal Hyphae: Absent (in mature ascomata). Hypothecium: Light brown or pale brown.

Asci: Broadly clavate, distinctly stipitate, 20-40 µm long, 8-14 µm wide; tholus not amyloid; ocular chamber absent or present (at least in young asci); dehiscence bitunicate (fissitunicate); exoascus not amyloid, not hemiamyloid; ascoplasm not dextrinoid.

Ascospores: Not uniseriate, c. 8 per ascus, spores 8 per ascus, ellipsoid, (8)-9-11.4-13-(16) µm long, 3-5.1-7 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, remaining hyaline, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)

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