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Mot de passe perdu? S'inscrire

10-10-2021 14:01

Marek Capoun Marek Capoun

Hello everybody, I need help with the determinatio

10-10-2021 01:24

Stefan Jakobsson

Hello, I found what I think is a hairless Cheilym

09-10-2021 16:32

Riet van Oosten Riet van Oosten

Hello, Found 08-10-2021, on soil. Discovered whil

05-10-2021 17:31

François Bartholomeeusen

A friend of mine found on Glyceria fluitans a pink

08-10-2021 08:56

Josep Torres Josep Torres

Hola.Unos pequeños apotecios de color claro, de e

08-10-2021 17:19

Chris Yeates Chris Yeates

Bonjour tous A recent collection of dung from mou

08-10-2021 17:34

Angel Pintos Angel Pintos

Hello,anybody has this:Upadhyay HP, 1981. A Monogr

06-10-2021 19:23

Riet van Oosten Riet van Oosten

Hello, Just a try ... Found by Willy Heimeriks,

06-10-2021 20:23

Aouali Souhila

Hi,I made an observation of balck stroma on cedar

06-10-2021 17:46

Angel Pintos Angel Pintos

Hello,anybody has the following article.Linnakoski

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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.
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Nicolas VAN VOOREN, 10-10-2021 18:29
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.