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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-03-29).

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe leuceriae Havryl. Type: Erysiphe leuceriae Havryl.

Taxonomic Literature: Taxonomic notes: +ascomatal outer wall cells irregularly shaped, 8-20 µm diam.; +appressoria indistinct; +vegetative hyphae geniculate, 4-6,5 µm wide. Havrylenko M., Nova Hedwigia 63: 71-79 (1996).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Leuceria thermarum (Phil.) Reiche; Leuceria, Compositae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid (light brown), orbicular (depressed globose), forming independently from the host thallus or mycelium, not emerging (partially), gregarious, .086-.112 mm in diam.. Margin: External filaments present; not interlaced, mycelioid, straight, 2-3 µm long, 5-6 µm in diameter, hyaline or pigmented (becoming brownish near the base and characteristically around septa), numerous, growing between the lower and upper hald of the ascocarp or on the upper half of the ascocarp, geniculate (bent), smooth, thin, not ramified or ramified, dichotomously branched (some with simple dichotomous branching either in the lower half or near the tips), septate (3 septa).

Asci: 10-14 asci per ascocarp, broadly clavate (mostly ellipsoid, occasionally somewhat angular in outline), distinctly stipitate, 52-73 µm long, 24-32 µm wide; dehiscence unitunicate.

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or mostly ovoid, 20-24 µm long, 12-16 µm wide; septa absent.

Conidiophores: Euoidium-type (foot-cells gradually widening from the base to top, followed by one to two shorter cells); basal cells 90-120 µm long, 16-20 µm wide. Conidium Formation: Conidiogenous cells in chains (shape and size variable). Conidia: Ellipsoid, doliiform, or cylindrical; macroconidial (germ tubes apical, terminating in clup-shaped appressoria), not branched, 27-57 µm long, 13-21 µm wide; aseptate.

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