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Sur Cytisus scoparius
Yannick Mourgues,
16-03-2009 23:09
Bonsoir à tous.Voici une chose curieuse trouvée sur bois mort décortiqué de Cytisus. Elle se présente sous la forme de nombreuses structures +- coniques, noires, couvertes de poils blanchâtres, avec au sommet un pore par lequel sort un liquide opaque brunâtre.
La micro ne donne pas grand chose :
Conidiospores cylindriques, hyalines, 2-3x1-1,5 um.
Structure les supportant : voir photo jointe ci-bas.
Poils hyalins, paroi épaisse 2-3um, en pointe arrondie, difficilement visibles dans KOH.
Paroi devenant violette dans KOH.
Je ne sais pas où chercher ce genre de chose... Une idée ???
Yannick
Yannick Mourgues,
16-03-2009 23:14
Re:Sur Cytisus scoparius
Hi.
Here is a curious thing found on dead decayed wood of Cytisus. It appears under the shape of numerous structures + - conical, black, covered with whitish hairs, with in the summit a pore by which a brownish opaque liquid goes out.
Micro doesn't look much:
Conidiospores cylindrical, hyalines, 2-3x1-1,5 um.
Structure supporting them: see photo joined.
Hyalins hairs, thick wall 2-3um, sharp rounded off, with difficulty visible in KOH.
Becoming wall dyes purple in KOH.
I don't know where to look for this specie... An idea???
Here is a curious thing found on dead decayed wood of Cytisus. It appears under the shape of numerous structures + - conical, black, covered with whitish hairs, with in the summit a pore by which a brownish opaque liquid goes out.
Micro doesn't look much:
Conidiospores cylindrical, hyalines, 2-3x1-1,5 um.
Structure supporting them: see photo joined.
Hyalins hairs, thick wall 2-3um, sharp rounded off, with difficulty visible in KOH.
Becoming wall dyes purple in KOH.
I don't know where to look for this specie... An idea???
Yannick Mourgues,
16-03-2009 23:14
Re:Sur Cytisus scoparius
autre vue...
Yannick Mourgues,
16-03-2009 23:15
Re:Sur Cytisus scoparius
Structure portant les conidiospores...
Yannick Mourgues,
16-03-2009 23:16
Re:Sur Cytisus scoparius
Paroi dans KOH
Wall in KOH
Wall in KOH
Christian Lechat,
17-03-2009 06:19
Re:Sur Cytisus scoparius
peut-être un Dendrophoma
Hans-Otto Baral,
17-03-2009 08:24
Re:Sur Cytisus scoparius
The violet KOH-reaction clearly proves that this is the anamorph of Proliferodiscus pulveraceus, the excipulum of which also reacts violet. As in Lachnellula the anamorph is currently called Cytospora.
Zotto
Zotto
Christian Lechat,
17-03-2009 09:10
Re:Sur Cytisus scoparius
Hi, Zotto,
I don't believe that it's the genus Cytospora because in this genus there are not pycnidia but pseudopycnidia, subperidermal, erumpent and multilocular conidiomata
Christian
I don't believe that it's the genus Cytospora because in this genus there are not pycnidia but pseudopycnidia, subperidermal, erumpent and multilocular conidiomata
Christian
Hans-Otto Baral,
17-03-2009 13:00
Re:Sur Cytisus scoparius
Hi Christian
thanks, this is an interesting idea. Erumpent would fit to tzhe anamorph Lachnellula, but not and mutlilocular. I see that Dharne compared Cytospora and others but finally decided that Naemaspora fits best. But apparenty these Naemaspora are light-coloured pycnidia while Cytospora is dark-coloured. I strongly suppose that true Cytospora does not have this violet KOH-reaction.
Earlier P. pulveraceus was also placed in Lachnellula. I think Spooner and Kohn wrote Cytospora
Zotto
thanks, this is an interesting idea. Erumpent would fit to tzhe anamorph Lachnellula, but not and mutlilocular. I see that Dharne compared Cytospora and others but finally decided that Naemaspora fits best. But apparenty these Naemaspora are light-coloured pycnidia while Cytospora is dark-coloured. I strongly suppose that true Cytospora does not have this violet KOH-reaction.
Earlier P. pulveraceus was also placed in Lachnellula. I think Spooner and Kohn wrote Cytospora
Zotto
Yannick Mourgues,
20-03-2009 21:18
Re:Sur Cytisus scoparius
Bonsoir et merci à tous les deux.
En résumé, il s'agit donc ici, si j'ai bien compris, de l'anamorphe de Proliferodiscus pulveraceus. Mais alors, Cytospora ou pas ?
Yannick
Good evening and thanks to both.
In summary, it is thus here, if I understood well, about the anamorphe of Proliferodiscus pulveraceus. But then, Cytospora or not?
Yannick
En résumé, il s'agit donc ici, si j'ai bien compris, de l'anamorphe de Proliferodiscus pulveraceus. Mais alors, Cytospora ou pas ?
Yannick
Good evening and thanks to both.
In summary, it is thus here, if I understood well, about the anamorphe of Proliferodiscus pulveraceus. But then, Cytospora or not?
Yannick
Hans-Otto Baral,
20-03-2009 22:15
Re:Sur Cytisus scoparius
I am unaware that anybody named the anamorph of P. pulveraceus although it is known since perhaps 100 years. But my opinion is that anamorphs do not need a separate name.
Anamorph nomenclature is a controversy issue. You can either use a generic name as a form genus, and then it is not so important that this is a phylogenetically defined group, only the morphological similarity is important. This is what I try to do. Or you give a name for any anamorph, which is a quite difficult and somewhat useless task.
Zotto
Anamorph nomenclature is a controversy issue. You can either use a generic name as a form genus, and then it is not so important that this is a phylogenetically defined group, only the morphological similarity is important. This is what I try to do. Or you give a name for any anamorph, which is a quite difficult and somewhat useless task.
Zotto
Yannick Mourgues,
20-03-2009 22:27
Re:Sur Cytisus scoparius
Thank you for this precision !
Yannick!
Yannick!