to LIAS


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



Oidium hortensiae Jørst.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-01). Data set reviewer(s): Schubert K. (06-07-25); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera polonica Siemaszko (pseudonym); Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Oidium hortensiae Jørst. Type: Oidium hortensiae Jørst.

Taxonomic Literature: Taxonomic notes: +hyphae tortuose, branched, septate, hyphal cells ca 40-50 x 5-7 µm; +appressoria multilobed, 5-25 µm wide, often opposite pairs;+conidiophores foot-cells straight, cylindric, followed by two shorter cells or a single longer cell;+haustoria globose, ca. 17.5-18.7 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [609] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Nearly cosmopolitan. Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Benelux (Belgium & Luxembourg), Germany, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Portugal, Greece, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, European Turkey, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

Ecology: Biotroph; phytopathogenic (mycelium dense, persistent or evanescent, white); growing on stems, leaves, and inflorescences. Host or Phorophyte Taxonomy: Hydrangea macrophylla (Thunb.) Ser.; Hydrangea, Hydrangeaceae.

Reproduction Strategy: Only known as sterile, asexually reproducing form.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched ((57-)70-90(-175) x 7.5-8.7 µm, few 5-celled conidiophores occur on both sides of the leaves); basal cells (10)-17-37.5-(50) µm long, 7.5-10 µm wide. Conidium Formation: Conidiogenous cells single and in chains (rarely short chains). Conidia: Ellipsoid and ovoid; macroconidial (germ tubes at an end, often multiple, short to moderately long, without terminal, lobed appressorium), not branched, (25)-30-40-(45) µm long, (14)-16-19-(20) µm wide; aseptate.

(report generated 04.Okt.2007)


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