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13-09-2025 14:10

Wim de Groot

We found this hymenoscyphus on rubus fruticulosis.

13-09-2025 15:43

Edmond POINTE Edmond POINTE

Bonjour Christian,J'ai trouvé deux spores ressemb

11-09-2025 16:57

Jason Karakehian Jason Karakehian

Our revision of Marthamycetales (Leotiomycetes) is

13-09-2025 14:01

Thomas Flammer

dark brown apothecia, splitIKI-Spores biguttulate

10-09-2025 23:53

Marcel Heyligen Marcel Heyligen

Found on Robinia pseudoacasia together with Diapor

10-09-2025 17:18

Blasco Rafael Blasco Rafael

Hola, encontre este estiercol de vaca estos apotec

02-09-2025 11:34

Thomas Læssøe

https://svampe.databasen.org/observations/10527903

07-09-2025 08:19

Josep Torres Josep Torres

Hello.Tiny pinkish discomycetes, photographed and

09-09-2025 12:07

Edmond POINTE Edmond POINTE

Bonjour amis mycologues,Trouvé sur moquette de ch

08-09-2025 19:07

ruiz Jose

Hola me pasan esta recolecta en madera de fraxinus

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Polydesmia sp. ?
Simon Gurtner, 31-01-2024 22:28
Simon GurtnerGood evening,

Here is a species I found on the stroma of an undetermined Pyrenomycete, on the inside of scales of a pine cone.


Apothecia 0.1 - 0.35 mm, gregarious, initially turbinate and whitish, then developed into a small disc and yellowish in colour. Short stalked, with few, relatively large anchor hyphae.


Ectal excipulum textura prismatica, horizontally orientated.


Asci 8 sp., clavate with hooks, inoperculate, biseriate and IKI+. n7 = (62) 69.31 (86.5) x (9.5) 10.14 (10.8)


Spores hyaline. Fusoid, inequilateral to allantoid. Mature spores with three septa and 4 oil drops. N 36= (16) 21.99 (28) x (3) 3.52 (4.1).
Many spores are peculiarly deformed (frost damage?)


Paraphyses hyaline, slender, cylindrical, partly forked and slightly twisted in the upper part. 1.5 - 2.5 my wide, with 2-3 septa.


I think of Polydesmia. P. turbinata has similarities, but has been described on stroma on Eucalyptus fruit capsules.
Maybe I am completely wrong.


Many thanks for your support


Simon

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Hans-Otto Baral, 01-02-2024 07:29
Hans-Otto Baral
Re : Polydesmia sp. ?
Good morning

it would be better to use oil immersion, this looks like 400x.

My guess is Pseudhelotium sordidulum (= P. vernale), with typically fusoid spores of that size.

I have it in my Hyaloscyphaceae folder.

At the margin are short septate hairs with sometimes yellow-brown granular exudate.

Polydesmia has apically irregularly branched paraphyses.
Simon Gurtner, 01-02-2024 15:32
Simon Gurtner
Re : Polydesmia sp. ?
Hallo Zotto

Vielen Dank für deine Eräuterung die absolut Sinn macht. 

Grüsse, Simon