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16-06-2019 11:54

Nicolas VAN VOOREN Nicolas VAN VOOREN

Hello.Here is a Hymenoscyphus species growing on b

16-06-2019 12:07

Riet van Oosten Riet van Oosten

Hello, Found by Theo Westra, 13-06-2019 (The Neth

14-06-2019 15:32

Malcolm  Greaves Malcolm Greaves

A small group of Perithecia on rotten (salix?) woo

14-06-2019 09:40

Per Marstad Per Marstad

I have found this in Norway, on hardwood, laying o

14-06-2019 06:40

Django Grootmyers

What is this parasite of Cantharellus minor? Found

11-06-2019 01:49

Valencia Lopez Francisco Javier

Hola amigos...Adjunto fotos de unas supuestas Para

11-06-2019 00:32

Elisabeth Stöckli

Bonsoir, Sur feuilles de ronce (Rubus/roncier à

11-06-2019 16:20

Garcia Susana

Hola, He recolectado este asco sobre estiercol, c

12-06-2019 22:42

Ethan Crenson

Hello all, A friend noticed these tiny fruiting b

11-06-2019 00:08

Ethan Crenson

Hello all, I found a few of these tiny black cush

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Arachnopeziza-like
Marc Detollenaere, 14-04-2019 16:53
Marc Detollenaere

Dear forum,


On the bark of Larix I found some some small cup-shaped apothecia 0.2-0.25mm on a copious whitish cobwebby subiculum. The hyphae showed some warts. Clamps were not present. Among the hyphae I found a lot of conidiospores of about 16x11µ.


The asci were uni- to irregularly biseriate and measured about 46x6µ. Spores were hyaline, allantoid and measured 7x2.5µ. The cylindrical paraphyses showed some small drops. Hairs were smooth, 20-30µ, and ended in a pointed tip.


Could this be Hyaloscypha fuckelii on hyphae of an anamorf fungus or belong anamorph and telemorph to the same species?

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Hans-Otto Baral, 14-04-2019 17:43
Hans-Otto Baral
Re : Arachnopeziza-like
Hyaloscypha is a good choice. I only wonder about the conspicuous drop in the living asci which reminds me of Psilachnum. Actually I know Psilachnum also from coniferous bark.

The broad hyphae are another fungus.
Simon Kennedy, 14-04-2019 19:24
Re : Arachnopeziza-like
The hyphae and spores, look very much like Haplotrichum, an anamorph of Botryobasdiium, a basidiomycete.

Simon
Marja Pennanen, 14-04-2019 20:58
Re : Arachnopeziza-like
Hello,

is it absolutely sure, that the hairs are not glassy?

Propably not a good idea, but these look like Olla millepunctata.

Marja
Hans-Otto Baral, 14-04-2019 21:10
Hans-Otto Baral
Re : Arachnopeziza-like
Hi Marja

definitely not. I see in some hairs an apical minute glassy knob, and that occurs sometimes in Hyaloscypha.

Zotto
Marc Detollenaere, 15-04-2019 20:37
Marc Detollenaere
Re : Arachnopeziza-like

Thank you for the suggestion Simon.I will try the anamorph key in Bernicchia


 


Marc

Marc Detollenaere, 15-04-2019 21:09
Marc Detollenaere
Re : Arachnopeziza-like

Good evening Hans-Otto


You are right about the vacuolar bodies although they are not always present.


Is Psilachnum the only choice with VB's?

Hans-Otto Baral, 15-04-2019 21:13
Hans-Otto Baral
Re : Arachnopeziza-like
I am not sure if these are VBs, although they are located in the vacuole. Not sure if they stain with CRB. And this drop does not only occur in Psilachnum. In Hyaloscypha I think it would be unusual.
Kosonen Timo, 16-04-2019 07:56
Kosonen Timo
Re : Arachnopeziza-like

Looks very much like a Hyaloscypha to me. Haven't seen Psilachnum-droplet often in Hyaloscypha, but occasionally yes, so not impossible. I think Larix is not that well known as a substrate (or maybe Raitviir knew it?). Most Hyaloscyphas show dextrinoid reactions, have you tried that? Works for dried material as well. Can't recall Psilachnums having dextrinoid reactions.


Timo


 

Marc Detollenaere, 16-04-2019 20:16
Marc Detollenaere
Re : Arachnopeziza-like
without a doubt an amyloid reaction
Hans-Otto Baral, 16-04-2019 20:20
Hans-Otto Baral
Re : Arachnopeziza-like
I think Timo means that hairs and excipular cells get a red stain in MLZ in various Hyaloscyphas.
Kosonen Timo, 17-04-2019 07:20
Kosonen Timo
Re : Arachnopeziza-like

:-), yep, hairs/excipula should turn something close to maroon / red wine / Earl Grey (no milk) (=dextrinoid). If something is turning blue only then you call it amyloid. But I'll take it that you just very much confirmed it as an Hyaloscypha.


T

Marc Detollenaere, 17-04-2019 21:05
Marc Detollenaere
Re : Arachnopeziza-like
I thought you meant the reaction of the apical apparatus. The hairs and the excipular cells don't react at all.
Kosonen Timo, 18-04-2019 07:44
Kosonen Timo
Re : Arachnopeziza-like
ok! but yes, it's the hairs/excipula that should react. It's not that strong reaction always, but usually there is something. A small complication if no reaction at all :-)

T