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

Podosphaera fusca (Fr.) U. Braun & N. Shishkoff

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: species. Synonyms: Sphaerotheca fusca (Fr.) S. Blumer; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe fusca Fr.

Taxonomic Literature: Taxonomic notes: +appressoria indistinct, sometimes slightly nipple-

+conidiophores foot-cells cylindric, followed by 1-3
+ascocarp outer wall cells conspicuous, large,
shaped, (10-)15-45(-55) µm diam.;.
Braun U., Beih. Nova Hedwigia 89: 1-700 [144-147] (1987); Kiss L., Szentiványi O., New Disease Reports 2 (August 2000 - January 2001).

Biogeography: Nearly cosmopolitan.

Ecology: Biotroph; phytopathogenic; growing on stems and leaves, amphigenous (mycelium at first hyaline, later gradually turning to brown, hardly separable from the cleistothecial appendages; groups of ascocarps, appendages and coloured hyphae often forming dark patches on the leaves or stems). Host or Phorophyte Taxonomy: Acanthaceae, Bignoniaceae, Campanulaceae, Compositae, Cucurbitaceae, Labiatae, Leguminosae-Papilionoideae, Polemoniaceae, Scrophulariaceae, Solanaceae, and Valerianaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered and gregarious, (.06)-.07-.1-(.12) mm in diam.. Margin: External filaments present; mycelioid (rather coarse, length variable, width irregular), .5-4 µm long, 4-10-(12) µm in diameter, hyaline and pigmented (brown throughout when mature, long appendages often paler or hyaline in the upper half), few (mostly few, less than 10, seldom more), up to 10 per mm², growing all across the lower half of the ascocarp (mostly; 4: occasionally) and on the upper half of the ascocarp, smooth and rough, thin, not ramified and ramified (occasionally), irregularly not branched, septate.

Asci: 1 asci per ascocarp, sub-globose, broadly clavate, or clavate, not stipitate or rarely indistinctly stipitate, 50-80-(100) µm long, 40-70-(80) µm wide; dehiscence unitunicate.

Ascospores: c. 8 (development of the ascospores usually fairly late, asci mostly immature) per ascus, spores 6-8 per ascus, subglobose, broadly ellipsoid, or ovoid, 13-20-(24) µm long, (11)-12.5-16-(18) µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiomata: Present; hyphomycetous (conidiophores erect foot cells cylindric, followed by 1-3 shorter cells).

Conidiophores: Oidium-type; not branched; basal cells (25)-40-80 µm long, 9-14.5 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, or doliiform; macroconidial, not branched, 24-45-(50) µm long, 14-22-(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.