Valsa abietis:
Cupressus macrocarpa: Portugal

Valsa ambiens - (Valsa ambiens subsp. ambiens):
Cupressus sargentii: Ukraine

Valsa friesii:
Cupressus sempervirens: Ukraine

Valsa sp.:
Cupressus duclouxiana: China

The pathogenic fungus, Leucostoma kunzei is the causal agent of Leucostoma canker (also known as Cytospora canker or spruce canker) a disease of spruce trees found in the Northern Hemisphere, predominantly on Norway spruce (Picea abies) and Colorado blue spruce (Picea pungens). This disease is one of the most common and detrimental stem diseases of Picea species in the northeastern United States, yet it also affects other coniferous species. Rarely does it kill its host tree; however, the disease does disfigure by killing host branches and causing resin exudation from perennial lesions on branches or trunks

Hi Alex,

thank you very much for the help.

   Erio

    I collected this Valsacea four times: three on Cupressus glabra and once on Chamaecyparis lawsoniana. In the collections there is some small difference in the sporal-dimensions , but the taxon appears substantially the same. I think to have never seen the anamorph Cytospora pinastri on such hosts (in November or in other months of the year) and neither the black line underneath.  The collections are from Forlì FC - Italy.

     Erio

Dear Erio

Here is the description about which you asked me (from Munk, 1957)

Alex