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05-07-2025 12:38

Åge Oterhals

I found this pyrenomycetous fungi in pine forest o

01-06-2025 09:37

Charles Aron Charles Aron

Hi All, I found this Octospora growing with liver

04-07-2025 20:12

Josep Torres Josep Torres

Hello.A fungus growing on the surface of a trunk o

20-06-2025 08:33

Josep Torres Josep Torres

Hello.Small, blackish, mucronated surface grains s

28-06-2025 16:00

Josep Torres Josep Torres

Hello.A tiny fungus shaped like globose black grai

04-07-2025 12:43

Castillo Joseba Castillo Joseba

me mandan el material seco de Galicia (España) 

03-07-2025 18:40

Castillo Joseba Castillo Joseba

me mandas el material seco de Galicia (España) re

03-07-2025 20:08

Francois Guay Francois Guay

I found this interesting yellowish asco growing on

01-07-2025 23:37

Josep Torres Josep Torres

Hello.A Pleosporal symbiotic organism located and

02-07-2025 17:26

Yanick BOULANGER

BonjourRécolté sur une brindille au fond d'un fo

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Macroconia leptosphaeriae vs. M. sphaeriae
Zuzana Sochorová (Egertová), 26-10-2021 22:13
Zuzana Sochorová (Egertová)Hello, a few days ago I have collected a Macroconia growing on Leptosphaeria doliolum (both of them growing on old Urtica).
Ascospores in this collection measure (15.6) 16.2 - 19.9 (20.5) × (5.8) 6 - 7.2 (7.4) µm, Q = (2.3) 2.33 - 3.1 (3.4). Me = 17.9 × 6.7 µm; Qe = 2.7. They are first hyaline, then brownish, one-septate, very finely punctate. I have measured the width in the thickest part, not in the constriction.


I am not sure whether to determine it as M. leptosphaeriae or M. sphaeriae. Fungi of temperate Europe state these two taxa are perhaps identical, but Grafenhan et al. 2011 distinguish them as two species. They write: "The distinction between Macroconia leptosphaeriae and
M. sphaeriae is based on the size of ascospores and conidia in the
type collections. According to Wollenweber (1926), the ascospores
of the type material of M. leptosphaeriae are smaller (14–18 ×
5–5.5 µm) than those of M. sphaeriae (19–25 × 5.8–6.5 µm)." 
Unfortunatelly I haven´t encountered any conidia, so I have to rely on ascospores. However, my values are between the values for the two species given by Wollenweber. Maybe this author measured dead ascospores (therefore smaller than my vital ones - then my collection would better fit M. leptosphaeriae)?

Thanks, Zuzana

  • message #70457
  • message #70457
  • message #70457
Christian Lechat, 27-10-2021 04:28
Christian Lechat
Re : Macroconia leptosphaeriae vs. M. sphaeriae
Dear Zuzana,

I think you can name your fungus Macroconia leptospaeriae. In my opinion, M. sphaeriae does not exist, it is a synonym of M. leptosphaeriae.

M. sphaeriae has never been sequenced or cultured, which makes the existence of this species questionable.

Christian
Zuzana Sochorová (Egertová), 27-10-2021 07:05
Zuzana Sochorová (Egertová)
Re : Macroconia leptosphaeriae vs. M. sphaeriae
Dear Christian,
Thank you very much for your reply. No existence of M. sphaeriae would make it much easier.
Zuzana