27-11-2025 15:41
Thomas LæssøeSpores brownish, typically 4-celled; 26.8 x 2.4;
27-11-2025 12:01
Thomas Læssøehttps://svampe.databasen.org/observations/10496727
27-11-2025 11:46
Thomas Læssøehttps://svampe.databasen.org/observations/10493918
27-11-2025 11:31
Thomas LæssøeCollectors notes: Immersed ascomata, erumpent thro
23-09-2025 13:31
Thomas Læssøehttps://svampe.databasen.org/observations/10534623
25-11-2025 14:24
Thomas Læssøehttps://svampe.databasen.org/observations/10490522
26-11-2025 18:13
Jason Karakehian
The entire run of Mycotaxon is now available throu
25-11-2025 11:03
Mick PeerdemanHi all,One of my earliest microscopy attempts, so
Pyrenopeziza on Alnus viridis
David Malloch,
22-05-2012 21:40
Dear Friends,This little discomycete appears every year on overwintered leaves of Alnus viridis near my home in New Brunswick. It looks a lot like the fungus Roland recently reported on Physocarpus opulifolius? except that it lacks verruculose hairs. It is similar in appearance to Pyrenopeziza fuckelii but the spores are too large. Any suggestions?
Dave
Hans-Otto Baral,
22-05-2012 21:54
Re : Pyrenopeziza on Alnus viridis
Dear Dave
my idea is that this is Pyrenopeziza betulina (Alb. & Schwein.) Rauschert? = Pyrenopeziza betulicola Fuckel.
This species has a complicated history, and it was even placed in Orbilia.
It is close to P. fuckelii = Microscypha monticola on Salix, but differs in longer spores. Ingo Wagner observed this difference in spore size also and made nice photos. I was so far only aware of finds on Betula, but it is no surprize to me that it also grows on Alnus.
Zotto
my idea is that this is Pyrenopeziza betulina (Alb. & Schwein.) Rauschert? = Pyrenopeziza betulicola Fuckel.
This species has a complicated history, and it was even placed in Orbilia.
It is close to P. fuckelii = Microscypha monticola on Salix, but differs in longer spores. Ingo Wagner observed this difference in spore size also and made nice photos. I was so far only aware of finds on Betula, but it is no surprize to me that it also grows on Alnus.
Zotto
David Malloch,
23-05-2012 00:01
Re : Pyrenopeziza on Alnus viridis
Dear Zotto,
Thank you for your informative and very prompt reply.
This fungus is VERY common here every spring and I am very pleased to have a name for it. Nothing is more annoying than being unable to identify a common fungus. I will check to see if this fungus is also on birch leaves.
Dave
Thank you for your informative and very prompt reply.
This fungus is VERY common here every spring and I am very pleased to have a name for it. Nothing is more annoying than being unable to identify a common fungus. I will check to see if this fungus is also on birch leaves.
Dave