Phyllactinia rhododendri H. D. Shin & Y. J. La

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-03-07).

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Phyllactinia suffulta f. rhododendri Jacz.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Phyllactinia rhododendri H. D. Shin & Y. J. La. Type: Phyllactinia rhododendri H. D. Shin & Y. J. La.

Taxonomic Literature: Taxonomic notes: +vegetative hyphae substraight to somewhat wavy, 70-140 ×4,5-6,5 µm, branching at right angle, with a septum near the branching point; +appressoria well-developed, nipple- to hook-shaped or branched, single or less frequently opposite in pairs; + ascomata outer wall cells polygonal to rounded, 13-26(-31) µm wide, not distinct; +ascomatal penicillate cells crowded on the upper part of the ascoma, 70-140 µm long, stems cylindrical, almost straight to irregular in width, 32-54 ×(6-)8-20(-24) µm and usually not divided at the upper portion, occasionally bifurcate into 2 branchlets, each branchlet short cylindrical, filaments 20-34 µm, shorter than stems in length, 2-3 µm wide. Shin H. D., Erysiphaceae of Korea. 1-320 [46-47]. Suwon, Korea (2000); Shin H. D. & Lee H. J., Mycotaxon 83: 301-325 (2002).

Biogeography: Continent: Asia-Temperate. Region(s): Far Eastern Asia (Far East of Russia). Country or state(s): Japan and Korea (North & South).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous. Host or Phorophyte Taxonomy: Rhododendron mucronulatum Turcz.; Rhododendron, Ericaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid (blackish brown), orbicular (depressed globose), forming independently from the host thallus or mycelium, scattered, .18-.26-(.28) mm in diam.. Margin: External filaments present; not interlaced, straight (acicular with a bulbose base, 26-42 µm wide at the ball, 8-10 µm wide above tha ball and gradually narrower upwards, apex 2,5-4,5 µm wide and obtuse), 1-1.6-(1.8) µm long, hyaline (throughout), few, 8-16 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, thick (above the ball and gradually thinner upwards), not ramified, aseptate.

Asci: 7-12-(16) asci per ascocarp, indistinctly stipitate (shortly stalked), 70-88 µm long, 34-44 µm wide; ocular chamber absent; dehiscence unitunicate (olivaceous, moderately thick-walled, but slightly thinner at the upper part).

Ascospores: 1–2 per ascus, spores 2 per ascus, oval, 32-48 µm long, 16-29 µm wide; septa absent; wall olive (olivaceous).

Conidiomata: Present; hyphomycetous.

Conidiophores: Ovulariopsis-type (conidiophores single or occasionally two on a hyphal cell, sometimes branched at the lower half, arising from the upper part of creeping hyphae, position mostly central, straight in foot-cells, followed by (2-)3 straigth cells of variable length, with a basal septum at 5-18 µm away from the branching point of the mycelium); not branched; conidiophore cells up to 550 µm long, basal cells 6-9 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Obpyriform (papillate at the apex) or clavate; macroconidial (germ tubes on the shoulder, short or long), not branched, 65-90 µm long, 25-36 µm wide; aseptate; cell wall hyaline; without distinct fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)