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22-10-2019 00:02

Yannick Mourgues Yannick Mourgues

On Fagus decorticated wood near a stream. Diametr

21-10-2019 21:53

Markov Sergey

I found small Scutellinia species on very wet very

21-10-2019 19:51

Mirek Gryc

HelloI warmly ask for your opinion on this collect

17-10-2019 17:04

Gilbert MOYNE

Bonjour, Une récolte de mardo 15/10/2019, Réser

21-10-2019 13:06

Castillo Joseba Castillo Joseba

Del pasado martes  en bosque de  piceas y hayasP

21-10-2019 12:53

Castillo Joseba Castillo Joseba

Del pasado Jueves en bosque de piceas, a 1250 m. d

21-10-2019 09:46

Koszka Attila

Dear Forum! Yesterday I found this species, is thi

15-10-2019 21:47

Stephen Mifsud Stephen Mifsud

Hi, my eye fell on a dead stalk of a herbaceous pl

20-10-2019 00:11

PASCAL DUBOC

Bonsoir sur bois pourrissant de feuillus en ripis

20-10-2019 19:22

BERNARD CLESSE BERNARD CLESSE

Bonsoir à toutes et tous,J'ai trouvé récemment

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Black Asco Immersed in Stem of Carex
Peter Thompson, 29-06-2019 15:10
Hello Everyone,

I have found a puzzling ascomycete with tiny spheres embedded just beneath the surface of a sedge stem, within an alder and willow carr environment. The perithecia are scattered, with ostioles just piercing the surface of their host.

The spores begin hyaline, filled with drops and with one central septum. By the time that they mature they have  become olivaceous brown with three septa. They typically measure between 35 to 37.5 x 8 um. The 8-spored asci do not react to lugol.

I have attached a photo of the fruit bodies as seen, peppering their host. Also, a photo, under immersion oil, of immature spores contained in an ascus and another showing mature spores and the structure of the excipulum.

I wonder if anyone has any idea as to which species they might be?

Thank You,
With Best Wishes,
Peter.
  • message #58329
  • message #58329
  • message #58329
Peter Wilberforce, 09-07-2019 10:00
Re : Black Asco Immersed in Stem of Carex

Hello Peter,


The spores remind me of the genus Astrosphaerella.


I have seen only the species A.stellata from old bamboo.


Regards,


Peter