A monograph ofValsaon hardwoods in North America

摘要

The species ofValsaandCytosporafound on hardwoods in North America are reevaluated, based on morphological studies of type specimens, herbarium specimens, and fresh collections. Three sections are accepted inValsa: sectionsValsa,MonostichaeNits., andCypriUrban, distinguished by the number, size, and arrangement of perithecia, the distribution of ostioles in the disc, and the size of ascospores. Four sections are accepted inCytospora: sectionsCytospora,Torsellia(Fr.) Gvrit.,Cytophoma(Hoehn.) Gvrit., andCytosporopsis(Hoehn.) Gvrit., based on the number and shape of the locules. Correlations between the teleomorphic and anamorphic sectionsValsandash;Cytospora,Monostichaendash;Torsellia, andCyprindash;Cytophomaare reaffirmed. Six species ofValsaon North American hardwoods are accepted, and two new subspecies are proposed:V. ambienssubsp.ambiensandV. ambienssubsp.leucostomoides(Peck) Spielman. Six species ofCytosporaare accepted.