valsa

{{Short description|Genus of fungi}}

{{Automatic taxobox

| image = 2016-01-24 Valsa salicina 597242.jpg

| image_caption = Valsa salicina on Salix twigs

| taxon = Valsa

| authority = Fr. (1849)

| type_species = Valsa ambiens

| type_species_authority = (Pers.) Fr. (1849)

| synonyms = Circinaria Bonord. (1851)

Circinostoma Gray (1821)

Engizostoma Gray (1821)

Microstoma Auersw. (1860)

| subdivision_ranks = Species

| subdivision =

}}

Valsa is a genus of fungi within the family Valsaceae.{{cite journal |vauthors=Lumbsch TH, Huhndorf SM |date=December 2007 |title=Outline of Ascomycota – 2007 |journal=Myconet |volume=13 |pages=1–58 |url=http://archive.fieldmuseum.org/myconet/outline.asp |publisher=The Field Museum, Department of Botany |location=Chicago, USA }} There are about 70 species in the widespread genus. Anamorphs are classified in the genus Cytospora.