Mycologia (2001) 93, 111-136

Thomas C. Harrington, Doug McNew, Joseph Steimel, Deborah Hofstra and Roberta Farrell (2001)
Phylogeny and taxonomy of the Ophiostoma piceae complex and the Dutch elm disease fungi
Mycologia 93 (1), 111-136
Abstract: The Ophiostoma piceae complex forms a monophyletic group of insect-dispersed pyrenomycetes with synnemata (Pesotum) and micronematous (Sporothrix) synanamorphs. Other species of Ophiostoma outside of the O. piceae complex that form synnemata lack the Sporothrix state. The nine recognized species within the O. piceae complex are delimited by synnema morphology, growth rate at 32 C, mating reactions and sequences of the internal transcribed spacer (ITS) region of the rDNA operon. Phylogenetic analysis of the ITS region suggests two major clades in the complex, one that causes bluestain in primarily coniferous hosts and the other on primarily hardwood hosts. In the coniferous group are O. piceae, O. canum, O. floccosum and the recently described O. setosum (anamorph Pesotum cupulatum sp. nov.). In the hardwood group are O. querci, O. catonianum, and the Dutch elm disease fungi: O. ulmi, O. novo-ulmi and O. himal-ulmi. Restriction fragment length polymorphisms of the ITS region are shown to be a convenient diagnostic tool for delimiting these species.
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Database assignments for author(s): Thomas C. Harrington, Roberta L. Farrell

Research topic(s) for pests/diseases/weeds:
identification/taxonomy

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Ophiostoma piceae
	Ophiostoma ulmi
	Ophiostoma novo-ulmi
	Ophiostoma setosum
	Ophiostoma himal-ulmi
	Ophiostoma canum
	Ophiostoma floccosum