19-05-2012 09:12
Andreas Gminder
Dear collegues,does by chance anyone has this publ
19-05-2012 13:15
maurice pelissierBonjour trouvé hier sur le mont benara discomycte
01-05-2012 22:00
bwergen
Hello,I have found a small pyrenomycete with black
17-05-2012 16:56
Pierotti AlessioQualcuno degli amici del Forum ha l'articolo:Parbe
16-05-2012 17:02
Enrique Rubio
Hi againWhat do you think about these small (up to
16-05-2012 19:52
Nicolas VAN VOOREN
Récolte à la base d'une tige morte d'Iris foeti
I am not able to locate this Valsacea (I presume). I hope that the following data and the photoes are enough for the location. Asci are 33-45(50)x5-6 micron about (only 8-spored) and ascospores (hyaline and without septa) are 8-12x2-2,5 micron about. In each stroma (whitish and 0,6-1 mm in diameter about) from 8 to 22 necks are visible. It is on dead and land branches of Cupressaceae in the month of November.
Erio
Below are data from ARS database.
May be it helps.
Alex
Leucostoma kunzei:
Cupressus macrocarpa: Ukraine
Valsa abietis:
Cupressus macrocarpa: Portugal
Valsa ambiens - (Valsa ambiens subsp. ambiens):
Cupressus sargentii: Ukraine
Valsa friesii:
Cupressus sempervirens: Ukraine
Valsa sp.:
Cupressus duclouxiana: China
= Valsa kunzei (Fr.) Fr., (1846)
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
Leucostoma-kunzei-0001.pdf
Hi Alex,
thank you very much for the help.
Erio
Your specimen is most probably (99%) Valsa friesii (Duby) Fuckel. To make sure, look if you can find on the same twig (or on others) its anamorph, Cytospora pinastri Fr., which has conidiomata with a single (rarely two) erumpent ostioles and numerous non-isolated embedded chambers. Both conidiomata and ascomata have no black line (conceptaculum) underneath, so it cannot be a Leucostoma.
The host looks like a Juniperus sp., no?
Could you please specify locality for your specimen as I am compiling info on distiribution of this species in Europe and beyond. Thank you.
Vera
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
How different was spore size in other your collections? On Cupressaceae another species occurs, V. abietis Fr. It has quite similar stromata but smaller spores (about 5-8 x 1.5-2 mkm) and asci (up to 35 mkm long), and additional distinguishing characters of the anamorph.
Vera
the width of the ascospores is almost the same, the average of the length doesn't exceed 1,5-2 micron between a collection and another collection.
Erio
Then it all should be V. friesii. In these two species spore length almost don't overlap. PLus, asci dimension and anamorphs are reliable characters.
Vera
thank you very much for your help too!!
Erio
Dear Erio
Here is the description about which you asked me (from Munk, 1957)
Alex
thank you very much again!!
Ciao
Erio