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27-03-2024 22:53

Charles Aron Charles Aron

Hi All,Recently I came across these minute, setose

26-03-2024 17:14

Juuso Äikäs

These little black ascos were growing on a dead, d

25-03-2024 13:41

B Shelbourne B Shelbourne

• Hyaloscyphaceae (no VBs), Hyaloscypha: Macro a

25-03-2024 21:27

Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde, March 2024

26-03-2024 14:37

DAVID MARCOS DAVID MARCOS

Spores (telles qu'elles apparaissent à l'intérie

24-03-2024 08:27

Thierry Blondelle Thierry Blondelle

HiOn Hedera helix fallen branchEcological habitat:

26-03-2024 11:06

michel bertrand

Bonjour, Malgré de nombreuses recherches, je n'a

25-03-2024 14:08

Ursula Kozik

Bonjour et bonne journée, On m'a envoyé une tro

25-03-2024 03:56

B Shelbourne B Shelbourne

• Scuttelinia: Macro and habitat.• S. scutella

25-03-2024 20:21

DAVID MARCOS DAVID MARCOS

Bonjour, je m'appelle David et je débute dans l'i

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Malvipezia howsei?
Marek Capoun, 10-10-2021 14:01
Marek CapounHello everybody, I need help with the determination of this Peziza.
Spooner's key leads me to Malvipezia (Peziza) howsei, but this key does not contain many species such as P. emileia etc.
Collected at the beginning of September, in a warm mixed, mainly deciduous forest on the humous calcareous, slightly eutrophic soil under Tilia and Juglans nigra, altitude cca 300 m, .
Apothecia gregarious in a loose group, up to 60 mm on average, mostly undulate, fawn with slightly violaceous tinge.
Asci with croziers, amyloid reaction WTR type.
Ascospores with Me = 19.8 × 9.1 µm, Qe = 2.2; with 2 LBs; verrucose, warts regular, isolated, punctate or short ridges, usually more pronounced at poles. The paper "Morphological and molecular study of Peziza emileia and P. howsei, two distinct taxa" by Medardi et al. defines the different ornamentation of spores quite clearly.
Excipulum is the problem. This cited paper, and other resources, of course, states a two-layered medullary excipulum, but I can't see 2 clearly defined layers. It seems to me, there are globose cells in the upper part of tissue, but in the lower part I can see some fusoid or pyriform, globose and angular cells, but no textura intricata or something like that. The subhymenium is supposed to be made up of cells of the text. intricata too, but I see such a structure again that I would not normally consider to be an intricata.
Thanks for help.
Marek
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Nicolas VAN VOOREN, 10-10-2021 18:29
Nicolas VAN VOOREN
Re : Malvipezia howsei?
Hi Marek.
At first sight, your collection is macroscopically similar to Malvipezia emileia, but the ascospores do not fit. So your determination is correct.
It perfectly illustrates why there are so much confusions between these two species.
Note that the one-layered excipulum seems to be a good feature to characterise species of Malvipezia.
Marek Capoun, 11-10-2021 00:58
Marek Capoun
Re : Malvipezia howsei?
Thank you, Nicolas, I liked to meet this species.
M.