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01-03-2015 16:25

Chris Yeates Chris Yeates

Bonjour tousI collected this intriguing discomycet

02-03-2015 16:29

Salvador Tello

Hola a todos.Hace unos días recogí unos hongos q

02-03-2015 21:08

Jenny Seawright Jenny Seawright

Hello all, This asco was found on old, thick stems

26-02-2015 16:10

Blasco Rafael Blasco Rafael

Hola, necesito alguna ayuda para saber por lo meno

02-03-2015 15:13

Chris Johnson

Good afternoonFound growing on the partly desiccat

01-03-2015 00:10

Patrice TANCHAUD

Bonjour,récolte réalisée sur mousses au sol en

01-03-2015 14:48

Jenny Seawright Jenny Seawright

Hello all, Hoping that help might be possible with

01-03-2015 14:56

Andreas Gminder Andreas Gminder

Hello,   today Tanja found a small white stipit

01-03-2015 14:59

Chris Johnson

Good afternoonThere are two papers on Coniochaeta

01-03-2015 13:22

Nina Filippova

Dear forum,I have something Botrytis- like that ma

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Unguiculariopsis-like on Eutypa
Chris Yeates, 01-03-2015 16:25
Chris YeatesBonjour tous
I collected this intriguing discomycete a couple of days ago on a small decorticated branch well covered with Eutypa (I suspect the tree was Acer pseudoplatanus).
When I saw the globose spores and iodine negative (both IKI & MLZ) asci, these combined made me think of Unguiculariopsis, a genus with few British records. I have collected U. ilicincola some years ago (on Ilex), and that is the total of my familiarity with the genus. I find Zhuang's monograph useful, but not completely so.

I would have assumed this to be U. ilicincola but for the fact that the excipular margin is completely different from what I expected. There is no evidence of the uncinate terminal cells one would expect, very well shown in Enrique's http://www.ascofrance.fr/search_recolte/3899

The excipulum consists of thick walled glassy cells which elongate towards the margin where they end as pigmented and lying more or less parallel. In addition a considerable number of these terminal cells bear an ornamentation of small globose bodies, which seem to be a part of the cell wall rather than a superficial coating (for example they were unaffected by 5% KOH). Perhaps the images will explain this better. I shall post images in more than one tranche as there are quite a few.

Details of the fungus are:
apothecia mostly in the region of 300-400µm when mature on ? Acer pseudoplatanus branch covered by a Eutypa species, many apo's on areas covered with damp algal growth
asci 8-spored J-, with croziers
ascospores spherical 2.7-3.3µm (so far too small for ilicincola ?)
paraphyses more or less parallel-sided; in MLZ (but not in IKI) they produced tiny globose iodine (?) particles, as can be seen in one of the photographs
excipulum
as explained above (images will follow as a second batch)

any suggestions more than welcome
amitiés
Chris
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Andreas Gminder, 01-03-2015 16:38
Andreas Gminder
Re : Unguiculariopsis-like on Eutypa

Hello Chris,


 


may be a Hyphodiscus, like hypothejus or something similar?


best regards,


Andreas

Chris Yeates, 01-03-2015 17:14
Chris Yeates
Re : Unguiculariopsis-like on Eutypa
Hallo Andreas
that is a very interesting suggestion, for which many thanks; on checking W. Zhuang's "Notes on Lachnellula theiodea" Mycotaxon XXXI, pp. 411-416 I am pretty sure that I have Hyphodiscus theiodeus as so many of the characters fit perfectly.

It is encouraging to read in that paper a quote from Richard Korf re this taxon " . . . .the ectal excipular layer of this discomycete is unlike that known to me in any other of the 'hairy inoperculate discomycetes' " - I don't feel so bad now about being baffled initially by the structure of the excipulum. I attach the relevant paper for completeness. I shall post my final images in a while. The only 'fly in the ointment' is that I could not see an iodine reaction at the ascus apex - I shall revisit that before drying the material.

LG
Chris
Chris Yeates, 01-03-2015 20:13
Chris Yeates
Re : Unguiculariopsis-like on Eutypa
Here are images showing precipitation in paraphyses in MLZ, and the glassy gelatinised ectal excipulum of textura intricata with numerous 'hairs' warted in their upper portion.

I still cannot get a J+ reaction even with pre-treatment in KOH.
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Hans-Otto Baral, 02-03-2015 22:46
Hans-Otto Baral
Re : Unguiculariopsis-like on Eutypa
Hi Chris

I did not read through your description because I thought the case is clear. Now you drew my attention by email to the inamyloid asci. Indeed, usually the species has hemiamyloid rings, while some species with ellipsoid spores exist having inamyloid asci. But I have a single collection of H. theiodeus (HB 8516b) which was also totally inamyloid. Images in Cubby, here my text to them:

Sjaelland, Allindelille Fredskov, Fagus branch c. 1.5 m above ground, on Peniophora. Ap. rehydr. 0.15-0.35 mm diam. Asci *35-45 x 5.7-6(-6.3) µm, with croziers, IKI-!, K+IKI dto. (2 ap. tested). Sp. *2.5-2.7(-3) x 2.4-2.6(-2.8) µm. Paraph. filled with 1refr. small or large guttules far down. Ectexc. near base partly covered by yellow pigment.

Zotto
Chris Yeates, 02-03-2015 23:21
Chris Yeates
Re : Unguiculariopsis-like on Eutypa
Many thanks for that information, Zotto; this is apparently only the second time this species has been recorded for the British Isles: http://www.fieldmycology.net/FRDBI/FRDBIrecord.asp?intGBNum=45183

Best wishes
Chris