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Mot de passe perdu? S'inscrire

06-12-2021 09:37

Castillo Joseba Castillo Joseba

Recolectada el pasado sabado, en terrenos  de cul

05-12-2021 12:00

Castillo Joseba Castillo Joseba

Recolectada ayer. pienso que la rama era de Celtis

02-12-2021 12:45

Stephen Mifsud Stephen Mifsud

I was revising some past identifications and I wis

02-12-2021 18:30

Khomenko Igor Khomenko Igor

Hi, this fall around Ottawa, ON, Canada I found a

05-12-2021 17:32

Andgelo Mombert Andgelo Mombert

Bonsoir, Sur branche morte attenante de Corylus a

28-07-2021 15:26

Jennifer Fiorentino

Would be very happy to receive your opinion on thi

05-12-2021 12:05

Joop van der Lee Joop van der Lee

Foound on horse dung.Ascomata: cup shaped; 333 um

03-12-2021 15:29

Chris Yeates Chris Yeates

Bonjour tous An Ascobolus sp. has appeared in som

03-12-2021 16:37

maurice pelissier maurice pelissier

Bonjour trouvé dans les Hautes Pyrénées sur un

23-09-2021 13:40

Björn Nordén

Hi all,Does anyone by any chance have The taxonom

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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.

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.