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Sphaerellothecium abditum Triebel

Data Set Maintenance: Data set compiled. Data set author(s): Cáceres M. (03-05-20). Data set not revised; not to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Sphaerellothecium. Dacampiaceae Körb. (1855); Dothideales.

Taxonomic Literature: Triebel D., Biblioth. Lichenol. 35: 1-278 [72] (1989).

Biogeography: Northern hemispheric. Continent: Europe, Northern America, and Asia-Tropical. Region(s): Northern Europe, Middle Europe, East Europe, Indochinese Pensinsula (Southeast Asia), and North and Central Mexico. Country or state(s): Norway, Sweden, Austria, France (excl. Corsica), and Greece; Nepal; Northwestern Mexico (Mexico).

Ecology: Biotroph; lichenicolous; endosubstratic (vegetative hyphae forming a reticulum inside the host thallus). Host or Phorophyte Taxonomy: Immersaria athroocarpa; Lecidea atrobrunnea, L. cf. atrobrunnea, L. leprosolimbata, L. paupercula.

Lichen Photobionts: Primary photobiont absent.

Thallus: Indistinct (vegetative hyphae light to dark brown, branched and anastomosed, verruculose).

Medulla: Iodine reaction in Lugol's solution negative.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose, forming inside the thallus or mycelium of the host, not emerging, moderately abundant, 40-60-(70) µm wide, 40-60-(70) µm high, with a dark brown surface. Wall: Not carbonized. Margin: Smooth, dark brown, homogenously pigmented, 5-10 µm wide; external filaments absent. Disk: Smooth. Exciple: Paraplectenchymatous; hyphae 4.5-8 µm wide, 4.5-8 µm long; not carbonized; brown. Periphyses: Absent or present (sometimes very short or absent). Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent. Hypothecium: Brown.

Asci: Almost globose (broadly ellipsoid to oval), not stipitate, 19-22 µm long, 13-15 µm wide; tholus not amyloid; ocular chamber present; broad; dehiscence bitunicate; exoascus not amyloid, not hemiamyloid; ascoplasm dextrinoid (epiplasma in young asci I+ orange).

Ascospores: Not uniseriate, c. 8 per ascus, spores 8 per ascus, oval, (9)-9.5-10.5-(12) µm long, (4.5)-5-5.5-(6) µm wide, obtuse; septa present; transversally septate, 1-transversally septate; lumina of equal size; wall thin (only seldom with thin halo), not constricted where the septum meets the spore wall or laterally constricted where the septum meets the spore wall (sometimes only slightly constricted at the septum), becoming pigmented, dark brown or middle brown, in Lugol's Solution negative, wall not ornamented (only seldom with thin halo).

Conidiomata: Absent resp. not observed.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)

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