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Phyllactinia corni 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). Data set reviewer(s): Schubert K.

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

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

Taxonomic Literature: Taxonomic notes: +vegetative hyphae substraight to somewhat wavy, variable in length, 30-70 µm long in wider hyphae and 60-110 µm in narrower hyphae, 3,5-7 µm wide, mostly branching at right angle, with a septum near the branching point; appressoria well-developed, variable in morphology, nipple- to rod-shaped, shortly branched, opposite in pairs or in sequences, less frequently single; +ascomata outer wall cells irregularly polygonal to subrounded, 10-21(-32) µm wide, not distinct; +ascomatal penicillate cells crowded on the upper part of the ascoma, 50-90 µm long, stems irregular to short cylindrical, irregular in width, 20-35(-42) × (10-)12,5-20(-25) µm and bifurcate or divided into several branches (2-8) at the upper portion, each branchlet short cylindrical to somewhat bulbose, filaments 15-25 µm, generally shorter than the stems, 2-3 µm wide. Shin H. D., Erysiphaceae of Korea. 1-320 [170-173]. Suwon, Korea (2000); Shin H. D. & Lee H. J., Mycotaxon 83: 301-325 (2002).

Biogeography: Continent: Asia-Temperate, Europe (All), and Northern America (Canada, USA). Country or state(s): Japan and Korea (North & South).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous. Host or Phorophyte Taxonomy: Cornus officinalis Siebold & Zucc.; Cornus, Cornaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid (blackish brown), orbicular (depressed globose), forming independently from the host thallus or mycelium, scattered, .16-.224 mm in diam.. Margin: External filaments present; not interlaced, straight (acicular with a bulbose base, 29-44 µm wide at the ball, 9-11 µm wide above the ball and gradually narrower upwards, apex 3-5 µm wide and obtuse), 1.2-1.8 µm long, hyaline (throughtout), few, 7-16 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: 11-18 asci per ascocarp, indistinctly stipitate (shortly stalked, occasionally stalks long or shortly bifurcate) or distinctly stipitate, 58-90 µm long, 30-42 µm wide; dehiscence unitunicate (olivaceous-brown, moderately thick-walled, but slightly thinner at the upper part).

Ascospores: 1–2 per ascus, spores 2 per ascus, oval, 31-39 µm long, 16-23 µm wide; septa absent; wall olive (olivaceous).

Conidiomata: Present; hyphomycetous.

Conidiophores: Ovulariopsis-type (conidiophores single on a hyphal cell, arising from the upper part of creeping hyphae, position mostly central, straight in foot-cells, followed by 2-3 cells, with a basal septum less than 10 µm away from the branching point of the mycelium); not branched; conidiophore cells 180-325 µm long, basal cells 5-6.5 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Clavate (non-papillate at the apex); macroconidial (germ tubes on the basal and upper side, but very accasionally on the median side, germ tubes straight, ca. 5 µm wide and up to 500 µm or longer), not branched, 50-95 µm long, 17-28 µm wide; aseptate; cell wall hyaline or pigmented (pale olivaceous to subhyaline, sometimes containing one large or several small oil drops); without distinct fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)

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