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28-07-2025 04:59

Richard Droker

Growing on resin (over moss on Tsuga heterophyll)l

28-07-2025 12:34

Enrique Rubio Enrique Rubio

Hi to everybody.I would appreciate any ideas about

13-06-2025 09:41

Josep Torres Josep Torres

Hello.A cerebriform ascomycete sprouting scattered

13-06-2025 16:34

Andgelo Mombert Andgelo Mombert

Bonjour,Un petit discomycète qui me résiste. Il

24-07-2025 19:02

Castillo Joseba Castillo Joseba

De esta mañana en tronco caido de Haya A ver si

21-07-2025 19:22

Ethan Crenson

Hello all,  Here is an Orbilia found by a friend

14-07-2025 11:20

Michel Hairaud Michel Hairaud

Bonjour, Voici une espèce de  (?) Hyaloscyphace

18-07-2025 23:03

Josep Torres Josep Torres

Hello.Fruitings between 51 and 130 microns in tota

17-07-2025 11:55

Castillo Joseba Castillo Joseba

De ayer en bosque de hayas y abetos, en tieraEjemp

16-07-2025 17:34

Bernard Declercq Bernard Declercq

Hello,I have trouble distinguishing above mention

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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