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12-06-2026 14:50

Mollisia revincta (?)
François Freléchoux François Freléchoux

Bonjour, Voici la brève description d'une Mollis

10-06-2026 21:16

Ascomycète stipité sp. sur Filipendula ulmaria
François Freléchoux François Freléchoux

Bonsoir,Le dernier du jour, en attendant votre avi

11-06-2026 16:24

Orbilia
Ethan Crenson

Hi all, Recently, a friend found this Orbilia in

11-06-2026 19:01

Spinellus-like fungus on Scathophaga stercoraria
William Slosse William Slosse

Hello all,In an attempt to make a culture of a sus

11-06-2026 19:03

IMPORTANT >> MAINTENANCE 15-06
Nicolas VAN VOOREN Nicolas VAN VOOREN

Chers membres d'Ascofrance,Le site sera placé en

10-06-2026 23:08

Mollisia nervicola ?
éric ROMERO éric ROMERO

Bonjour tous, Je vous propose un Mollisia trouvé

09-06-2026 18:32

Vibrisseaceae(?) sur phragmites
Camille Mertens

Sur morceau de roseau immergé 0,5 - 0,7 mm de dia

10-06-2026 12:54

A dematiaceous hyphomycete on Filipendula
Steve Clements

Bonjour encore, Pouvez-vous m'aider, s'il vous pl

10-06-2026 21:07

Pyrénomycète ? sur Gentiana lutea
François Freléchoux François Freléchoux

Toutes les tiges de gentianes jaunes de l'an passÃ

10-06-2026 13:41

Ascomycète sp. sur Gentiana lutea
François Freléchoux François Freléchoux

Bonjour à nouveau, Voici une trouvaille d'hier.

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On Pseudotsuga cones, Discosia pini ? - Discosia strobilina ?
Ethan Crenson, 23-03-2021 06:34
Hello all,

I found these black pycnidia of an imperfect asco growing on a cone of Pseudotsuga menziesii in a cemetery/arboretum in Brooklyn, New York, US.  I believe these belong to the genus Discosia, but I'm uncertain of the species.

The pycnidia are black, lightly striate, elliptical, flat, sometimes with a pore or ostiole developing in the center. They are smaller than 1mm in length. 

The conidia are hyaline, fusiform, 3-septate, usually with 2 long setulae emerging from one side of the conidiospore near the outer septa.  Many of the conidia I observed had deformed outer cells as though those cells were deflated or malformed.  I'm not sure if that is an important feature or if it's an anomoly caused by environmental factors.  Conidia size: (14.5) 18-20 x 3µm, the setulae range from 5-14µm in length.  The conidia were almost uniformly 3µm wide, without any variation.

Because of the substrate, two possibilities may be Discosia pini and Discosia strobilinia. But I don't have any experience with this genus, so hopefully someone can help.

Many thanks in advance,

Ethan
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  • message #68045
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Bernard Declercq, 23-03-2021 15:00
Bernard Declercq
Re : On Pseudotsuga cones, Discosia pini ? - Discosia strobilina ?
Hi Ethan,

 Compare with D. strobilina which has conidia with the lower middle cell longer than the upper one. D. pini has middle cells of about the same length.

Bernard
Ethan Crenson, 23-03-2021 15:27
Re : On Pseudotsuga cones, Discosia pini ? - Discosia strobilina ?
Thank you Bernard! D. strobilina--I think you're right.  At a glance the middle cells are quite different in length.  Is the deformation of the outer cells anything to consider, or just an anomoly? (I have seen it happen to Bertia moriformis spores as well.)  And is there a recent paper I can find about Discosia?

Ethan