Leveillula helichrysi V. P. Gelyuta & Simonyan

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-03-21).

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

Type Information: Basionym: Leveillula helichrysi V. P. Gelyuta & Simonyan. Type: Leveillula helichrysi V. P. Gelyuta & Simonyan.

Taxonomic Literature: Taxonomic notes: + ascomata outer peridial cell 5-25 µm diam., angular-irregular to sinuous in outline, dark brown. Boyle H. & Braun U., Mycologia Balcanica 2: 179-180 (2005).

Biogeography: Northern hemispheric. Continent: Europe. Country or state(s): Germany, Poland?, France (excl. Corsica) (?), and Ukraine.

Ecology: Biotroph; phytopathogenic; growing on leaves. Host or Phorophyte Taxonomy: Helichrysum arenarium L.; Helichrysum, Compositae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, not emerging (immersed in the dense tomentum of the host leaves), .13-.19 mm in diam.. Margin: External filaments present; mycelioid (shorter than the diameter of the fruit boda), straight, 4-10 µm in diameter, hyaline and pigmented, numerous, growing all across the lower half of the ascocarp, thin, not ramified and ramified, aseptate and septate.

Asci: 5-15 asci per ascocarp, indistinctly stipitate, 60-100 µm long, 35-50 µm wide; dehiscence unitunicate (saccate).

Ascospores: 1–2 per ascus, spores 2 per ascus, broadly ellipsoid (ends broadly rounded) or ovoid, 25-40 µm long, 14-25 µm wide; septa absent; wall hyaline.

Conidiomata: Present; hyphomycetous.

Conidiophores: Oidiopsis-type (conidiophores emerging through stomata, erect, filiform, flexuous, long, pluriseptate, hyaline, thin-walled, smooth or almost so); not branched; conidiophore cells up to 250 µm long, basal cells 6-10 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Broadly ellipsoid (primary conidia), obovoid, doliiform, cylindrical, or clavate; macroconidial (dimorphic, primary and secondary conidia, primary conidia broadly ellipsoid-obovoid, 40-50 × 16-22 µm, length/width ratio 2,2-2,7, apex broadly rounded, base subtruncate, secondary conidia subcylindrical, rarely subclavate-doliiform, (35-)40-55(-60) × 14-20 µm, length/width ratio 2,2-3,7 µm, ends rounded to subtruncate), not branched, rounded at one end or truncate at one end (base subtruncate (primary conidia)), 40-50 µm long, 16-22 µm wide; aseptate; cell wall hyaline.

(report generated 04.Okt.2007)