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23-06-2018 19:29

Thorben Hülsewig

Hi there, last week i found this anamorph on rott

24-06-2018 18:40

Andgelo Mombert

Bonsoir,Je suis en train de travailler un lachnum

22-06-2018 18:10

Jan Knuiman

Hello,Yesterday I found these discomycetes with a

23-06-2018 17:35

Nicolas VAN VOOREN Nicolas VAN VOOREN

Here is a very small Helotiales growing on rotting

24-06-2018 03:37

M Jonathan M Jonathan

Je sais qu'il manque des info, mais il est si dist

12-06-2016 23:19

Björn Wergen Björn Wergen

Hi there,today I was in Freibourg (Black Forest) f

08-06-2018 17:05

Pascal RIBOLLET

Bonjour,Trouvé sur vieux Diatrypaceae, environ 25

10-12-2013 16:45

Garcia Susana

Hi all Found these apothecia growing on old wood

23-06-2018 14:31

Castillo Joseba Castillo Joseba

en madera de abetoA ver que os pareceSaludosJoseba

22-06-2018 16:24

BERNARD CLESSE BERNARD CLESSE

Bonjour à toutes et tous,Je pense avoir trouvé P

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Byssosphaeria
Dartanha Soares, 03-06-2016 22:10
Dartanha SoaresHi to all,
I found this fungus on a decorticed wood (unknown) in southeast Brazil after several days of rain.
I first classified it as Herpotrichia, but after a closer exam it occurred to me that it fits better into Byssosphaeria. However, I realized that this two genera share a lot of characteristics and their morphological distinction seems to be very subtle (at least to me!!).
The specimen has black superficial ascomata 500-600 ?m, growing over a subiculum and with hyphal appendages covering its lower 2/3; apex flatened, ostiolum yellowish, producing reddish extractable pigments and staining reddish in KOH 10%, walls 65-80 m thick, and presenting an areolate pattern; asci 150-160 ?m long (including pedicel), pedicel 40-50 ?m long; ascospores 28-42 x 6-8 ?m, 1-septate, becoming 3-septate (old and germinating ascospores), initially hyaline, becoming pale brown to yellowish brown when mature, with a mucilaginous sheath surrounding ascospores and protruding at ends as appendages.

Based in the works of Barr (Mycotaxon 20:1-38) and Chen & Hsieh (Sydowia 56:24-38) this specimen fits well within B. scheidermayeriana. Although ascomata are smaller compared with the sizes provided by Chen & Hsieh (720-900), they still fit with those provided by Barr (500-825).

Additionally to the works of Barr (1984), Chen & Hsieh (2004) and Mugambi & Huhndorf (2009) I checked other papers describing or reporting Byssosphaeria/Herpotrichia, but except by the comments in Barr's work, none of them mention the KOH reaction of the opening region. Since the light coloured ostiolum is commonly present in Byssosphaeria, but sometimes difficult to see in dry specimens, it occurred to me that perhaps the KOH reaction could be an easy and quick test to separate Byssosphaeria from Herpotrichia. Looking at Barr's paper (Mycotaxon 20: 1-38) it was not clear to me if in all Byssosphaeriaspecies the reaction was "positive" since for some species she wrote "pigment not leaching out in KOH". This mean that the "mouth" turned reddish, but without leaching the pigments, or it didn't turn reddish at all?

So, I was wondering who wants to check this hypothesis performing the KOH reaction in yours Byssosphaeria/Herpotrhichia specimens and sharing the results here in the forum. Or if anybody knows this is bullshit, share that too!!


Thanks
Dartanha

  • message #43117
Thorben Hülsewig, 30-05-2018 21:23
Re : Byssosphaeria
Hi Dartanha,

here is my result of the KOH Reaction on my B. schiedermeyeriana.

best regards,
Thorben
  • message #53609
  • message #53609
  • message #53609
  • message #53609