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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

11-09-2025 16:57

Jason Karakehian Jason Karakehian

Our revision of Marthamycetales (Leotiomycetes) is

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

03-09-2025 21:59

Philippe PELLICIER

La Léchère, Col de la Madeleine, alt 1970m, au s

06-09-2025 21:40

David Chapados David Chapados

Hi, Does somebody know the genus that has those b

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Am I right or totally wrong with Ascobolus geophilus?
Maria Plekkenpol, 14-09-2019 21:53
Maria PlekkenpolHolland, 07-09-2019. In riverclay area on soil (old piece of riverbank). Apothecium yellowish/greenish, darkening into brown when older, largest 2,5-3 mm. Asci clavate, 155-190 x 18-20, no Meltzer reaction (J-).
Spores mature deep purple, young hyaline. I think I saw very fine granulation in the young spores, as well as fine warts. Mature spores with fissures/reticulated, 19-21 x 10-13.
Paraphyses slender, longer than the asci, yellow(ish). Septated, sometimes forked, with a slightly swollen top (not all of them).
Following van Brummelen I came to Ascobolus geophilus, but maybe I'm very wrong :) 

What is your opinion? Thanks in advance!
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Michel Delpont, 15-09-2019 09:08
Michel Delpont
Re : Am I right or totally wrong with Ascobolus geophilus?
Hello Maria.

Interesting! It is sometimes difficult to separate certain species of this genus. Compares with A.behnitziensis near geophilus. According to Dissing, geophilus spores are later adorned ornamented, unlike behnitziensis. Also try to make other preparations in the Melzer showing the asci; you say negative Melzer whereas normally the reaction must be positive.


Michel.

Viktorie Halasu, 15-09-2019 09:29
Viktorie Halasu
Re : Am I right or totally wrong with Ascobolus geophilus?
Hello Maria,
van Brummelen states that only very young asci are amyloid in A. behnitziensis - i.e., the blueing might be visible only in lower part of the hymenium, see here: https://www.nahuby.sk/obrazok_detail.php?obrazok_id=606132
Cheers,
Viktorie
Maria Plekkenpol, 15-09-2019 10:09
Maria Plekkenpol
Re : Am I right or totally wrong with Ascobolus geophilus?
Thank you both very much for your quick reply! Sadly I only found two little fruitbodies and the material I tried to save has turned bad. What I can say is that the material I examined did have mature but also very young asci and I looked at your link Victorie, but there was no blue colouring anywhere in the hymenium.
Michel, what I read in van Brummelen about geophilus:

Asci cylindric-clavate, tapering
downwards, rounded above, 160-200 X 17- 20 p. (according to Seaver rgr6, I.e.:
"200-250 X 15- 18 p,"), 8-spored; the wall not, or scarcely, blue in Melzer's reagent.

So I am now a bit confused?
Michel Delpont, 15-09-2019 12:07
Michel Delpont
Re : Am I right or totally wrong with Ascobolus geophilus?
As stated by Viktorie the reaction is sometimes weak and only on young asci, especially on the walls. Maybe your Melzer is not focused enough?

I hope you will find new apothecies to be able to specify the determination.

Michel.


Maria Plekkenpol, 15-09-2019 17:56
Maria Plekkenpol
Re : Am I right or totally wrong with Ascobolus geophilus?
Thank you both!!