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Roberts, Rodney G. Alternaria roseogrisea, a new species from achenes of Helianthus annuus (sunflower). Mycotaxon 103: 21-26. 2008.

ABSTRACT: Alternaria roseogrisea was isolated from the achenes of Helianthus annuus during studies conducted in 1983-85 to document the diversity of fungi occurring in sunflower seeds and the possible role these fungi play in degradation of oilseed quality. A. roseogrisea was reported as “Alternaria sp. 2” in this early study because there were no published descriptions in Alternaria to accommodate it, a deficiency that has persisted. More recently, cluster analyses of combined RAPD, RAMS (microsatellite) and AFLP fingerprints support the placement of A. roseogrisea within the A. infectoria species-group sensu Simmons and its segregation from other members of this group. A. roseogrisea is known only from high-quality oil-type sunflower seed, and is recognized by the grayish-pink color of mature colonies on 6% NaCl-tomato juice agar and the striking appearance of the very small, often one or two-celled conidia separated by secondary conidiophores that can be many times the length of and nearly as wide as the conidia themselves.

KEYWORDS: hyphomycetes, sporulation pattern, Alternaria infectoria

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