Eutypella ? on Crataegus sp. - Forum ASCOFrance

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Eutypella ? on Crataegus sp.

Ethan Crenson, 20-02-2017 19:26

Hello,
From Central Park, NYC, on the bark of Crataegus sp. Short erumpant clustered black beaks that appear sulcate. Perithecia surrounded by white powdery material. Spores allantoid, yellow-brown. Asci 8-spored, some with long stipes. They appear IKI- though it is quite hard to discern. Asci 48-58um by 6.5-8um. Spores with 1 or more guttules at each end. 8.5 - 12um by 1.5 - 2.5um.
Any help would be greatly appreciated.

Paul LEROY, 20-02-2017 22:30

Re : Eutypella ? on Crataegus sp.

Bonsoir Ethan,
Je suppose que ce spécimen est Eutypella leprosa. La forme un peu dyatripoÏde des stromas et l'entostroma blanc est caractéristique de cette espèce. Les mensurations ainsi que la couleur des spores conviennent également. L'appareil apical est amyloide mais assez difficile à obtenir, même après prétraitement KOH.
Cette espèce est présente en Europe et en Amérique du Nord sur différents arbustes et arbrisseaux dont Crataegus.
Paul

Ethan Crenson, 21-02-2017 15:21

Re : Eutypella ? on Crataegus sp.

Thank you Paul. I have tried, but was not successful at viewing the apical apparatus by pretreating in KOH. However, this was my first attempt at using that technique. Are there any resources that might help me learn it properly?

Eduard Osieck, 22-02-2017 22:33

Re : Eutypella ? on Crataegus sp.

Hello,

See the comment by the expert in an earlier thread: http://www.ascofrance.fr/search_forum/27030 !!

Eduard

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