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Sphaerellothecium subtile Triebel & Rambold

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 Data set not revised; not to be published after submission.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., Rambold G. & Nash III T.H., Mycotaxon 42: 263-296 [287] (1991).

Biogeography: Northern hemispheric, coastal and colline. Continent: Northern America. Region(s): North and Central Mexico (Northeastern Mexico). Country or state(s): Northeastern Mexico (Mexico) (Baja California).

Ecology: Biotroph; lichenicolous; endosubstratic or episubstratic (vegetative hyphae form a supercial reticulum on the thallus of the host); growing on bark. Host or Phorophyte Taxonomy: Teloschistes chrysophthalmus.

Lichen Photobionts: Primary photobiont absent.

Thallus: Indistinct (vegetative hyphae brown, torulose, branched and anastomosed).

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, globose or subglobose, forming inside the thallus or mycelium of the host, soon sessile, 25-30-(40) µm wide, 25-30-(40) µm high, with a black surface. Wall: Not carbonized. Margin: Black, 5-10 µm wide; external filaments absent. Disk: Smooth. Exciple: Paraplectenchymatous; hyphae 3-4 µm wide, 4-5 µm long; not carbonized; brown. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent. Hypothecium: Brown.

Asci: Broadly clavate, indistinctly stipitate, 16-20 µm long, 8-9 µm wide; tholus not amyloid; ocular chamber present; dehiscence bitunicate (fissitunicate); exoascus not amyloid, not hemiamyloid; ascoplasm dextrinoid (epiplasma I+ orange).

Ascospores: Not uniseriate (irregularly distichously in the asci), c. 8 per ascus, spores 8 per ascus, ellipsoid, (6.5)-7.5-8-(8.5) µm long, 3-3.5 µm wide, obtuse; septa present; transversally septate, 1-transversally septate; lumina of equal size; wall thin, not constricted where the septum meets the spore wall or laterally constricted where the septum meets the spore wall (sometimes slightly constricted at the septum), becoming pigmented, middle brown, 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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