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23-09-2018 05:26

xian zhang xian zhang

Hello everyone, Is this specimen Pachyella clypen

21-09-2018 11:57

Vasileios Kaounas Vasileios Kaounas

At the moment I do not have enough data.Just a fri

23-09-2018 22:21

Marc Detollenaere Marc Detollenaere

Good evening, On dead leaves of Ammophila I found

18-09-2018 14:10

Savic Dragisa

Is this Pachyella punctispora? I found it on a dam

23-09-2018 13:36

Rubén Martínez Gil Rubén Martínez Gil

Hola a todos. Subo unas fotos de una Peziza que e

23-09-2018 14:10

Rubén Martínez Gil Rubén Martínez Gil

Hola a todos. Subo unas fotos de una Peziza que e

24-09-2018 19:12

Castillo Joseba Castillo Joseba

Localizado ayer  en restos de madera de haya quem

21-09-2018 23:44

Edouard Evangelisti Edouard Evangelisti

Bonjour le forum, Pourriez-vous m'aider à confir

13-09-2018 19:17

Marc Detollenaere Marc Detollenaere

Dear forum, Yesterday I found setous fruit bodies

21-09-2018 15:10

Johan Myhrer

Central sweden in a marsh by a shallow lake I foun

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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