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

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;
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)

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.