Botanische Staatssammlung München © 1995–2008
Data remain intellectual property of the data set authors.

The description has been generated directly from a database. In cases of errors and insufficiencies consult the corresponding LIAS data entry and revision forms to make the necessary modifications. Changes will appear in the subsequent update of data entry forms and natural language descriptions. [To verify the actual status of the pages, select the reload frame function in the context menu!]
These pages are XHTML compatible designed. May be that problems arise with older web browser versions.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Microsphaera extensa var. extensa Cooke & Peck; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, irregularly polygonal, ca. 7.5-20
µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [358-359] (1987).

Biogeography: Continent: Northern America (USA, Canada, generally distributed).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (80)-90-170 mm in diam.. Margin: External filaments present; 2-6 µm long, 5-10 µm in diameter, hyaline or faintly pigmented (sometimes near the base), 5-22 per mm², growing between the lower and upper hald of the ascocarp, flexuose, smooth or rough (often), thin or moderatly thick (towards the base), ramified, dichotomously branched (3-6 times, closely and regularly, sometimes primary branches elongated and branches looser, tips of the ultimate branchlets recurved, appendages sometimes forked in the lower half), aseptate or septate (with a single septum at the base).

Asci: 4-10 asci per ascocarp, sub-globose (often), not stipitate or indistinctly stipitate, 45-65 µm long, 35-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 4-6 per ascus, subglobose, ellipsoid, or ovoid, 18-25 µm long, 12-17 µm wide; septa absent.

Conidiophores: Not branched. Conidium Formation: Conidiogenous cells single. Conidia: Cylindrical; macroconidial.

In case that additional characters and states are required to be included in this data set, consult the LIAS Instructions to Participants and follow the procedures described there.

LIAS Home