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

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera hypericacearum U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Alphitomorpha hyperici Wallr. Type: Alphitomorpha hyperici Wallr.

Taxonomic Literature: Taxonomic notes: +appressoria lobed;+conidiophores foot-cells short, cylindric, followed by 1-2 shorter cells or cells of about the same length;+ascomata outer wall cells irregularly polygonal, obscure, ca. 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [293] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Europe, and Northern America (USA, Canada, introduced). Region(s): Siberia and China (+Central Asia). Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Iran.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Hypericum hirsutum L.; Hypericum, Guttiferae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .085-.14 mm in diam.. Margin: External filaments present; mycelioid or setiform, straight, 2-8 µm long, 6-9 µm in diameter, hyaline or pigmented (faintly coloured near the base), numerous, growing between the lower and upper hald of the ascocarp (radiately spread), flexuose (and long; 3: fairly straight or undulate (-geniculate)) or geniculate (bent), smooth or faintly rough (below), thin or thick (towards the base), not ramified or ramified, dichotomously branched (a varying percentage of appendages, 1-2(-3) times, branchings loose, deep, tips straight), septate.

Asci: 5-8 asci per ascocarp, not stipitate or indistinctly stipitate, 50-70 µm long, 30-50 µm wide; dehiscence unitunicate.

Ascospores: 1–2 or c. 4 per ascus, spores (2)-3-5 per ascus, ellipsoid or ovoid, 18-24 µm long, 10-18 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; conidiophore cells (0)-0-0-0-(0) µm long, basal cells 25-30-(36) µm long, 8-10 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Cylindrical; macroconidial, not branched, 30-38 µm long, 12-18 µm wide; aseptate.

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