Podosphaera aphanis (Wallr.) U. Braun & S. Takam. var. aphanis

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

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: variety. Synonyms: Sphaerotheca aphanis var. aphanis (Wallr.) U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Alphitomorpha aphanis Wallr.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric or somewhat increasing from base
to top, long, 50-160 µm, ca. 8-13.5 µm wide near then
base, followed by 2-3 shorter cells, basal septum sometimes somewhat
away from the branching point of the mycelium;
+appressoria
indistinct to nipple-shaped;
+ascom. outer cells irregularly shaped
or polygonal, ca. 6-25(-30) µm in diam.;
+ascom. ext.fil.
length extremely variable (0.25-2) or (2-6) x ascoc.diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [104-105] (1987).

Biogeography: Nearly cosmopolitan. Continent: Africa, Asia-Temperate, Australasia, Europe, Northern America, Southern America, Pacific, and Asia-Tropical. Region(s): Southern Africa, Siberia, Middle Asia, China, Australia, New Zealand, Subarctic America, Western Canada, Eastern Canada, North-western U.S.A., North-Central U.S.A., North-eastern U.S.A., South-western U.S.A., South-Central U.S.A., and South-eastern U.S.A. Country or state(s): Iceland; Japan and Taiwan.

Ecology: Biotroph; phytopathogenic; growing on stems (often dense) and leaves. Host or Phorophyte Taxonomy: Myrtaceae and Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or densely gregarious, (.06)-.07-.1-(.11) mm in diam.. Margin: External filaments present; interlaced with each other or interwoven with surrounding mycelium (often also with the hairs of the host leaves), mycelioid, 3.5-8 µm in diameter, hyaline or pigmented, mostly numerous, growing all across the lower half of the ascocarp, flexuose or geniculate (bent) (the shorter ones flexuous-geniculate), smooth or faintly rough, thin, not ramified, not branched (rarely irregularly branched), septate.

Asci: 1 asci per ascocarp, 60-95 µm long, 50-75 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores (6)-8 per ascus, nearly globose or ellipsoid (shape variable), (16)-18-26-(30) µm long, 11-18 µm wide; septa absent; lumina of equal size.

Conidiomata: Present; hyphomycetous.

Conidiophores: Oidium-type; not branched; basal cells 50-160 µm long, 8-13.5 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, or doliiform; macroconidial, not branched, acuminate at both end, 23-44 µm long, 15-26 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)