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04-11-2025 09:07

Josep Torres Josep Torres

Hello.A suspected Hymenoscyphus sprouting on a thi

04-11-2025 12:43

Edvin Johannesen Edvin Johannesen

Hi! One more found on old Populus tremula log in O

04-11-2025 14:53

Josep Torres Josep Torres

Hello.Very small, globose, mucronate perithecia, b

03-11-2025 21:34

Edvin Johannesen Edvin Johannesen

These tiny (0.4-0.5 mm diam.), whitish, short-stip

03-11-2025 19:41

David Chapados David Chapados

Hi,Does anyone knows which genus could this be? G

28-10-2025 15:37

Carl Farmer

I'd be grateful for any suggestions for this strik

03-11-2025 16:30

Hans-Otto Baral Hans-Otto Baral

Hello I want to ask you if you have found this ye

01-11-2025 09:14

Francis Maggi

Bonjour,Trouvé sur Xanthoria parietina à Valdebl

28-10-2025 19:33

Nicolas Suberbielle Nicolas Suberbielle

Bonjour à tous,Je voudrais votre avis sur cette r

31-10-2025 09:19

Lothar Krieglsteiner Lothar Krieglsteiner

Can somebody provide me with a file of:Rogerson CT

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Orbilia with 'hyphomycete'
Chris Yeates, 05-08-2013 19:28
Chris YeatesBonsoir tous
yesterday I collected a damp rotten decorticated branch (probably Taxus); there are several species of fungi on it; one is an Orbilia which I feel reasonably confident is O. eucalypti - I have collected this species in this wood before, though on a different substrate (see: http://www.ascofrance.com/search_forum/21451 )
Of interest was a conidium of a sort one often associates with aquatic, Ingoldian, fungi - we have had a lot of rain recently and I have noticed conidia normally though of as primarily aquatic in wet terrestrial habitats). The conidium a strong resemblance to Tripospermum camelopardus, although it has an extra "neck" - because of the three-dimensional nature of the condium I have tried (not entirely successfully I fear)? to use stacking software to give an idea of its size and point of attachment (it is the upper left "neck" in the attached image). If it is a Tripospermum, then there clearly is no link between the two fungi (that genus is anamorphic Capnodiaceae); but I may be wrong in assigning it there. I know Zotto is interested in putative anamorphs of Orbilia (some of which do have potentially aquatic anamorphs). Others may be interested too, so I post this find here.

Cordialement
Chris

  • message #24690
  • message #24690
  • message #24690
  • message #24690
Hans-Otto Baral, 05-08-2013 21:52
Hans-Otto Baral
Re : Orbilia with 'hyphomycete'
Hi Chris

the conidium does not look orbiliaceous.  The kind of branching is unusual. The filament to the right is the conidiophore? Dies it have a faint colour or is it from Congo red?

Yes, this is the sublobose-spored variant of eucalypti, certainly geneticaly not different because sometimes also normal asci and spores are found in the same population.




Zotto
Chris Yeates, 05-08-2013 22:34
Chris Yeates
Re : Orbilia with 'hyphomycete'
Thanks for the confirmation Zotto; with regard to the conidium, no, all the "arms" are part of it (and no stain, must be an artefact - it was difficult to render this in 2 dimensions); I have since checked Prof. Ingold's protologue for Tripospermum camelopardus (see attached); this conidium quite strongly resembles his undescribed T. sp. As you can see the original point of attachment is the shorter of the "giraffe's" two legs.
So certainly an unconnected stray . . . .
best wishes
Chris
Hans-Otto Baral, 05-08-2013 22:37
Hans-Otto Baral
Re : Orbilia with 'hyphomycete'
Yes, you are certainly right!

Zotto
Esquivel-Rios Eduardo, 05-08-2013 23:20
Re : Orbilia with 'hyphomycete'
"Tripospermun myrti (Lind). Hughes. 1951. Mycol. pap. 46:17-18
Conidia with stalk cell 6-10 x 4- 7 mu, arms up t0 30 mu long, 4-8 thick at the base,tapering 1-2 mu, 1 - 4 septate, often constricted at the septa; one of the arms in this species usually lies parallel to the stalk cell"