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13-02-2015 14:40

Mario Filippa

January 6, 2015. On decorticated wood of Alnus glu

12-02-2015 19:56

Godorova Olga Godorova Olga

Hello, dear friends.Two days ago we were in Negev

13-02-2015 01:22

Malcolm  Greaves Malcolm Greaves

This Podospora was on horse dung. At first I was c

12-02-2015 23:42

Miguel Ãngel Ribes Miguel Ángel Ribes

Another Hymenoscyphus, now on pinecone of Pinus sy

06-02-2015 12:29

Blasco Rafael Blasco Rafael

Hola, tengo esta muestra recogida en rama caida de

11-02-2015 00:47

Miguel Ãngel Ribes Miguel Ángel Ribes

Good nightI have two different collection of Hymen

12-02-2015 17:14

Blasco Rafael Blasco Rafael

Hola, tengo lo que creo es un Hysterobrevium, lo m

08-02-2015 16:42

Lepista Zacarias

I would like to have your help to identify this Sc

10-02-2015 00:23

Jenny Seawright Jenny Seawright

Hello all, This seems to be Propolomyces versicolo

11-02-2015 08:39

Francisco  SÃNCHEZ Francisco SÁNCHEZ

Bonjour. Je ai un rassemblement de 02.02.2015 de

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Rosellinia
Mario Filippa, 13-02-2015 14:40
January 6, 2015. On decorticated wood of Alnus glutinosa.

Stromata up to 1 mm wide, subglobose, with a flattened upper side and the base narrower than the maximum diameter, slightly wider than high, with papillate ostiole; walls hard, surface smooth (not rugose, not cracked). Subiculum present on the wood, not or scarcely present between the stromata that remain mostly well separated.

  • message #33797
  • message #33797
Mario Filippa, 13-02-2015 14:41
Re : Rosellinia
Asci almost invisible in water; in Melzer with an apical apparatus I+ very strong, dark blue, cork-shaped, clearly longer (4,5-5,5 µm) than wide.
  • message #33798
  • message #33798
  • message #33798
Mario Filippa, 13-02-2015 14:42
Re : Rosellinia
Spores 20-25x6,5-7(10) µm, brown, elongated, with a more convex side and the other almost flattened, papillate at the ends, with a long germ slit rather straight running from a pole to the other along the flat side. Biguttulate in Melzer, uni-or biguttulate in water.

In mature spores no gel sheath is visible. Around very fresh spores, in water, can be present a sheath of gel around the ends and in the immature ones seems to be visible even around the whole spore.

  • message #33799
  • message #33799
Mario Filippa, 13-02-2015 14:44
Re : Rosellinia

Trying to observe the gel sheath I mounted some asci in Cresyl blue; it seems to be visible around the immature spores, but I still have doubts because the young spores + the intended "gel" have the same size of a mature spore, so the "gel" should be included in the walls when completely formed...


And the apical apparatus is very complex, and consistent... Very interesting!


All in all the nearest species appears to be Rosellinia britannica but I have not a good knowledge of this genus.


What do you think?


Thank you


Mario

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  • message #33800
  • message #33800
Jacques Fournier, 13-02-2015 14:53
Jacques Fournier
Re : Rosellinia
Hi Mario,
yes this is typical R. britannica. The sheath is often best seen by contrast in India ink. It does not stain in usual stains but it does in aqueous nigrosin, incubated overnight.
Cheers,
Jacques
  • message #33801
Mario Filippa, 13-02-2015 15:32
Re : Rosellinia
Merci bien Jacques, plus vite que ton ombre...!
J'irai essayer avec de l'encre alors.
Salut!
Mario