25-11-2025 14:24
Thomas Læssøehttps://svampe.databasen.org/observations/10490522
25-11-2025 11:03
Mick PeerdemanHi all,One of my earliest microscopy attempts, so
24-11-2025 15:23
Arnold BüschlenHallo, auf einer offenen Kiesfläche am Rande ein
23-11-2025 11:16
Bohan JiaHi, I found small discs growing on dead stem of
21-11-2025 10:56
Christopher Engelhardt
Very small (~0,5 mm) white ascos, found yesterday
Rythismataceae
Garcia Susana,
25-03-2015 23:19
I found this ascomycete growing on stem of Equisetum arvense.
0.5 to 1 mm are the measured to ascomata.
The spores have numerous septa (I counted to 11). They have one rounded apex and the other pointed. They are straight or slightly curved.
The paraphyses are multiseptadas, x 2.3-3um wide, and with the apex slightly swollen (to 4um).
Asci and paraphyses present a species of gel that keeps together by the apex.
I do not have a key to the genera of Rhytismataceae, but looking at the literature that I have, I think it could be Naemacyclus. At first I thought of N. caulium but both the spore size as the asci is significantly higher. I've seen that those sizes would fit better with N. lamberti, but I haven't a clear description of the species.
Can anyone help?
a greeting
Susana
Hans-Otto Baral,
26-03-2015 08:43
Re : Rythismataceae
I am quite sure this is Karstenia idaei. The genus belongs in Ostropales.
The asci are not inamyloid: I see a faint red reaction on the ascus wall. If you view when the Lugol comes in contact with the hymenium then you should see a faint blue front before all turns red.
More instructiv is to pretreat with KOH. Afterwards you will get a blue hymenium.
Equisetum seems a very exceptional substate for the species, but it is actually plurivorous, including ligneous hosts.
Zotto
The asci are not inamyloid: I see a faint red reaction on the ascus wall. If you view when the Lugol comes in contact with the hymenium then you should see a faint blue front before all turns red.
More instructiv is to pretreat with KOH. Afterwards you will get a blue hymenium.
Equisetum seems a very exceptional substate for the species, but it is actually plurivorous, including ligneous hosts.
Zotto
Garcia Susana,
26-03-2015 22:32
Re : Rythismataceae
Hola Zotto,
Es cierto, se trata de un Ostropal.
Pero, el tamaño esporal encaja con Karstenia idaei? La descripción que yo tengo dice que las esporas son de 40-60 x 3-4um. Las que yo he medido no llegan a 3um de ancho.
Gracias, un saludo
Susana
Es cierto, se trata de un Ostropal.
Pero, el tamaño esporal encaja con Karstenia idaei? La descripción que yo tengo dice que las esporas son de 40-60 x 3-4um. Las que yo he medido no llegan a 3um de ancho.
Gracias, un saludo
Susana
Hans-Otto Baral,
26-03-2015 22:46
Re : Rythismataceae
You are right. I have measurements from *41-64 x 3-3.2(-3.6) µm to *59-73 x 4-4.5 µm. But your spores did not look to mee so narrow. Another possibility would be K. macer.
These Karstenia species are not at all easy, and I feel there are more species hidden behind my images. My drawing Karstenia macer, HB 6113.JPG looks microscopically like yours. The apothecia have black lobes but your fungus is also somewhat dark, isn't it?
So maybe K. macer would be a better choice.
Zotto
These Karstenia species are not at all easy, and I feel there are more species hidden behind my images. My drawing Karstenia macer, HB 6113.JPG looks microscopically like yours. The apothecia have black lobes but your fungus is also somewhat dark, isn't it?
So maybe K. macer would be a better choice.
Zotto
Garcia Susana,
26-03-2015 23:46
Re : Rythismataceae
Hola,
Con Karstenia macer encaja perfectamente.
Si, mis ascomas también tienen el margen ennegrecido.
Gracias de nuevo.
Susana
Con Karstenia macer encaja perfectamente.
Si, mis ascomas también tienen el margen ennegrecido.
Gracias de nuevo.
Susana