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25-03-2015 23:19

Garcia Susana

Hi all:I found this ascomycete growing on stem of

26-03-2015 20:04

Enrique Rubio Enrique Rubio

I'd like to know your opinion about this Mycosphae

26-03-2015 19:25

Enrique Rubio Enrique Rubio

Hi to everybody Several times we have found this

26-03-2015 18:00

Vasileios Kaounas Vasileios Kaounas

I understand that the information will show you, i

25-03-2015 21:10

Salvador Tello

Hola a todos.Me gustaría cononer vuestra opinión

26-03-2015 13:36

Cvenkel Miran

(Slovenia, on stone):  photo ref photoCan't find

26-03-2015 10:55

Stephen Martin Stephen Martin

I have found this ascomycete (Peziza sp.?) from my

19-03-2015 10:15

Blasco Rafael Blasco Rafael

Hola, tengo this Muestra Recogida en Orilla Lago 1

24-03-2015 12:19

Kosonen Timo Kosonen Timo

Hello, Salut!I joined the forum two months ago and

25-03-2015 13:02

Blasco Rafael Blasco Rafael

Hola tengo esta muestra sobre rama caida de Corylu

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Rythismataceae
Garcia Susana, 25-03-2015 23:19
Hi all:

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

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Hans-Otto Baral, 26-03-2015 08:43
Hans-Otto Baral
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
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
  • message #34756
Hans-Otto Baral, 26-03-2015 22:46
Hans-Otto Baral
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
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