Golovinomyces rogersonii U. Braun

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. (06-06-20).

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Golovinomyces rogersonii U. Braun.

Taxonomic Literature: Taxonomic notes: Differt a G. verbasci conidiis angustioribus, 12-20 µm latis, ascis saepe guttulatis; + hyphae of the mycelium branched, septate, thin-walled, almost smooth to verruculose, 2.5-7 µm wide; appressoria indistinct to nipple-shaped, solitary; outer peridial cells of chasmothecia irregular-sinuous, 10-25 µm diam., wall about 10-25 µm thick, composed of up to 5 appressed cell layers. Braun U., Delhey R., Dianese J. C. & Hosagoudar V. B. (2006), Schlechtendalia 14: 85-97.

Biogeography: Northern hemispheric. Continent: Northern America (USA). Country or state(s): Utah (USA).

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, sepals (and pedicels), or fruits, epiphyllous (mainly) or amphigenous. Host or Phorophyte Taxonomy: Cordylanthus maritimus ssp. canescens (A. Gray) T. I. Chuang & Heckard; Cordylanthus, Scrophulariaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid (dark brown to blackish), orbicular (subglobose), forming independently from the host thallus or mycelium, not emerging (mostly more or less immersed in the dense mycelium), scattered or gregarious, .1-.15 mm in diam.. Margin: External filaments present (shorter than the diameter of the chasmothecia); not interlaced, mycelioid, straight, 2-9 µm in diameter, hyaline or pigmented (to yellowish or pale brown), mostly few (sometimes even rudimentary), growing all across the lower half of the ascocarp, flexuose, smooth or rough (verruculose-rugose), thin or moderatly thick (only slightly thickened), not ramified, aseptate or septate (sparingly septate).

Asci: 10-15 asci per ascocarp, globose (broadly obovoid, saccate), not stipitate or distinctly stipitate, 50-70 µm long, 25-45 µm wide; dehiscence unitunicate (terminal thin-walled part (oculus) 10-20 µm diam., often guttulate, with oil-droplets of different size).

Ascospores: 1–2 per ascus, spores 2 per ascus, broadly ellipsoid or ovoid, 15-28 µm long, 9-17 µm wide; septa absent.

Conidiomata: Present.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Broadly ellipsoid, ovoid, doliiform, or citriform (limoniform); macroconidial (l/w ratio 1.4-2.6 (in mature conidia 1.4-2.0)), not branched, 20-40 µm long, 12-20 µm wide; aseptate; without distinct fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)